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Summary of Significant Accounting Policies (New Accounting Pronouncements and Changes in Accounting Principle) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase to net cash provided by operating activities $ 316,384 $ 289,434  
Corresponding offset to net cash used for financing activities $ 193,730 274,342  
Accounting Standards Update 2016-09 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase to net cash provided by operating activities   5,941  
Corresponding offset to net cash used for financing activities   $ (5,941)  
Increase to deferred tax assets     $ 913
Accounting Standards Update 2016-09 [Member] | Paid-in Capital [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net cumulative effect adjustment     2,582
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net cumulative effect adjustment     $ 1,669