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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of the federal statutory income tax rate to the Company's effective income tax rate      
Federal statutory income tax rate 35.00% 35.00% 35.00%
Foreign rate differential (4.80%) (3.00%) (2.60%)
Tax Cuts and Jobs Act of 2017 (70.90%) 0.00% 0.00%
Book basis in excess of tax basis for dispositions 17.40% 0.00% 0.00%
Tax benefit from stock-based compensation (6.30%) 0.00% 0.00%
Other (2.80%) 1.00% 1.10%
Effective income tax rate (30.80%) 35.00% 36.50%
State Income Taxes [Member]      
Reconciliation of the federal statutory income tax rate to the Company's effective income tax rate      
State income taxes / Federal benefit of state taxes 2.50% 3.00% 4.60%
Federal Benefit of State Taxes [Member]      
Reconciliation of the federal statutory income tax rate to the Company's effective income tax rate      
State income taxes / Federal benefit of state taxes (0.90%) (1.00%) (1.60%)