Annual report pursuant to Section 13 and 15(d)

Business Segments and Customer Information, Major Customers (Details)

v2.4.0.8
Business Segments and Customer Information, Major Customers (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenue, Major Customer [Line Items]      
Revenue, by customer $ 471,638 $ 546,755 $ 580,762
Percentage of revenue by customer (in dollars per share) 100.00% 100.00% 100.00%
U.S. Navy [Member]
      
Revenue, Major Customer [Line Items]      
Revenue, by customer 123,307 120,867 140,551
Percentage of revenue by customer (in dollars per share) 26.10% 22.10% 24.20%
U.S. Army/Army Reserve [Member]
      
Revenue, Major Customer [Line Items]      
Revenue, by customer 101,736 182,412 231,615
Percentage of revenue by customer (in dollars per share) 21.60% 33.40% 39.90%
U.S. Air Force [Member]
      
Revenue, Major Customer [Line Items]      
Revenue, by customer 3,625 6,963 11,971
Percentage of revenue by customer (in dollars per share) 0.80% 1.30% 2.00%
Total Department of Defense [Member]
      
Revenue, Major Customer [Line Items]      
Revenue, by customer 228,668 310,242 384,137
Percentage of revenue by customer (in dollars per share) 48.50% 56.80% 66.10%
U.S. Postal Service [Member]
      
Revenue, Major Customer [Line Items]      
Revenue, by customer 142,203 130,866 75,964
Percentage of revenue by customer (in dollars per share) 30.10% 23.90% 13.10%
Department of U.S. Treasury [Member]
      
Revenue, Major Customer [Line Items]      
Revenue, by customer 35,929 33,369 41,434
Percentage of revenue by customer (in dollars per share) 7.60% 6.10% 7.10%
Department of Energy [Member]
      
Revenue, Major Customer [Line Items]      
Revenue, by customer 20,124 20,898 23,010
Percentage of revenue by customer (in dollars per share) 4.30% 3.80% 4.00%
Department of Interior [Member]
      
Revenue, Major Customer [Line Items]      
Revenue, by customer 1,545 16,884 24,254
Percentage of revenue by customer (in dollars per share) 0.30% 3.10% 4.20%
Other government [Member]
      
Revenue, Major Customer [Line Items]      
Revenue, by customer 40,919 32,231 28,160
Percentage of revenue by customer (in dollars per share) 8.70% 5.90% 4.80%
Total Federal civilian agencies [Member]
      
Revenue, Major Customer [Line Items]      
Revenue, by customer 240,720 234,248 192,822
Percentage of revenue by customer (in dollars per share) 51.00% 42.80% 33.20%
Commercial [Member]
      
Revenue, Major Customer [Line Items]      
Revenue, by customer $ 2,250 $ 2,265 $ 3,803
Percentage of revenue by customer (in dollars per share) 0.50% 0.40% 0.70%