Income Taxes Income Taxes- Reconciliation of US Statutory Federal Income Tax Rate To Effective Income Tax Rate (Details)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	35.00%	35.00%	35.00%
State and local income taxes, net of federal benefit	3.00%	2.00%	2.00%
Foreign tax rate differential	(7.00%)	(10.00%)	(8.00%)
Cetip investment impairment loss	0.00%	9.00%	0.00%
Other	(2.00%)	1.00%	0.00%
Total provision for income taxes	29.00%	37.00%	29.00%

Effective Income Tax Rate Reconciliation, Impairment Loss on Long Term Investment, 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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