Recent Accounting Standards Recent Accounting Standards (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 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	$ 4,623
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	0	$ 3,966
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Net	$ 15,900		$ 16,500