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Income Taxes Income Taxes (Table 3) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Abstract]      
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries $ 26,615    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate 35.00% 35.00% 35.00%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential (5.30%) (3.60%) (2.70%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount (3.00%)    
Effective Income Tax Rate Reconciliation, State and Local Income Taxes 2.00% 1.70% 1.10%
Effective Income Tax Rate Reconciliation, Nondeductible Expense 0.20% 0.14% 0.20%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance 0.00% 0.00% (0.10%)
Effective Income Tax Rate Reconciliation, Deductions, Other 0.20% 0.90% 0.80%
Effective Income Tax Rate, Continuing Operations 29.10% 34.10% 34.30%