Recent Accounting Standards Recent Accounting Standards (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	$ 3,346
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	0	$ 2,181
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Net	$ 16,300		$ 16,500