New Accounting Pronouncements New Accounting Pronouncements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by (used in) financing activities	$ (6,266)	$ 222,440
Net cash provided by (used in) operating activities	$ 15,298	(16,558)
Accounting Standards Update 2016-09, Statutory Tax Withholding Component [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by (used in) financing activities		(700)
Net cash provided by (used in) operating activities		$ 700