Supplemental Consolidated Balance Sheet and Statement of Operations Information - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Accrued Liabilities and Other Liabilities [Abstract]
Accrued vacation	$ 4,336	$ 3,604
Accrued commissions	2,307	2,470
Accrued bonuses	6,421	9,598
Estimated health insurance claims	1,100	900
Accrued other liabilities	3,013	3,822
Accrued expenses and other current liabilities	$ 17,177	$ 20,394