New Accounting Guidance - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax provision	$ 30,142	$ 25,850	$ 52,403	$ 55,160
Net cash provided by operating activities			238,075	182,372
Net cash used in financing activities			(190,702)	$ (117,394)
Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax provision	$ (3,000)		(10,100)
Net cash provided by operating activities			3,800
Net cash used in financing activities			$ (3,800)