Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in income	$ (3,212)		$ (125)	$ (4,857)	$ 302
Accrued liabilities	158,838			158,838		$ 134,332
Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax benefit	1,100			22,400
Retained Earnings | Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to retained earnings		$ 1,300
Out of period adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in income	1,900
Accrued liabilities	$ 1,900			$ 1,900