Basis of Presentation and Nature of Operations - Schedule of Contract Assets and Contract Liabilities Reported under New Accounting Standard (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Contract receivables, net	$ 167,170	$ 168,318
Contract assets	128,522	123,197
Contract liabilities	32,281	38,571
Retained earnings	445,375	434,766
ASU 2014-09 | As Reported
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Contract receivables, net		291,515
Contract assets	127,978	123,197
Deferred revenue		38,571
Contract liabilities	$ 32,281	38,571
Retained earnings		$ 434,766