Annual report pursuant to Section 13 and 15(d)

Business Segments and Customer Information Business Segments and Customer Information, Geographic Area (Details)

v3.6.0.2
Business Segments and Customer Information Business Segments and Customer Information, Geographic Area (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 691,790 $ 533,982 $ 424,071
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 638,726 481,466 422,519
Other Countries      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 53,064 $ 52,516 $ 1,552