Basis of Presentation (New Financial Accounting Standards) (Details) - USD ($) $ in Thousands		9 Months Ended
	Jan. 01, 2017	Sep. 30, 2017	Sep. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in cash from operating activities		$ 129,857	$ 96,676
Decrease in net cash from financing activities		$ 193,492	322,128
ASU 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reduction in tax expense	$ 1,100
Increase in cash from operating activities			1,100
Decrease in net cash from financing activities			$ 1,100