Business and Basis of Presentation - New Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Basic earnings per share (in dollars per share)	$ 0.44	$ 0.55
Diluted earnings per share (in dollars per share)	$ 0.43	$ 0.54
Cash provided by operating activities	$ (29,605)	$ 13,331
Net income	$ 36,433	$ 44,987
Accounting Standards Update 2016-09 | New Accounting Pronouncement, Early Adoption, Effect
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Basic earnings per share (in dollars per share)		$ 0.06
Diluted earnings per share (in dollars per share)		$ 0.06
Net income		$ 4,800
Accounting Standards Update 2016-09, Statutory Tax Withholding Component | New Accounting Pronouncement, Early Adoption, Effect
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash provided by operating activities		$ 4,800