Income Taxes - Reconciliation of the Federal statutory income tax rate to the Companys effective 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 income taxes — net of Federal tax benefit	(4.50%)	2.90%	4.60%
Foreign tax rate differential	1.80%	(0.20%)	0.50%
Domestic production deduction	(6.60%)	(3.10%)	(3.00%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other	7.00%	1.30%	1.00%
Changes in unrecognized tax benefits	(2.50%)	(0.20%)	(0.90%)
Foreign tax incentives	(3.00%)	(2.20%)	(1.40%)
Valuation allowances	9.00%	0.00%	0.80%
Other	0.20%	0.00%	0.60%
Effective tax rate for the year	36.40%	33.50%	37.20%

Effective Income Tax Rate Reconciliation, Changes in Unrecognized Tax Benefits

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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 attributable to changes in the valuation allowance for deferred tax assets.

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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 attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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