Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
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	(2.60%)	(2.50%)	(2.80%)
Capco contingent consideration	0.00%	5.90%	0.00%
Other	(3.60%)	(3.90%)	(2.60%)
Effective income tax rate	31.80%	37.50%	32.60%
State Income Taxes [Member]
Reconciliation of the federal statutory income tax rate to the Company's effective income tax rate
State income taxes	4.60%	4.60%	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	(1.60%)	(1.60%)	(1.60%)

Effective Income Tax Rate Reconciliation, Business Combination, Contingent Consideration, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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