Income Taxes - Reconciliation of the Federal statutory income tax rate to the Companys effective tax rate (Details)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Statutory Federal income tax rate	35.00%	35.00%	35.00%
State income taxes — net of Federal tax benefit	4.20%	0.70%	(1.40%)
Foreign tax rate differential	0.50%	0.40%	(5.10%)
Domestic production deduction	(2.90%)	(3.50%)	0.80%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other	1.50%	2.00%	(0.90%)
Changes in unrecognized tax benefits	(1.60%)	(14.40%)	0.00%
Non-deductible goodwill	0.00%	3.10%	(16.20%)
Non-taxable claims settlement gain	0.00%	0.00%	2.60%
Valuation allowances	1.20%	3.00%	0.00%
Other	(1.20%)	1.00%	1.20%
Effective tax rate for the year	36.70%	27.30%	16.00%

Effective Income Tax Rate Reconciliation, Changes in Unrecognized Tax Benefits

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Effective Income Tax Rate Reconciliation, Nondeductible Expense, Goodwill

+ References

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- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

+ References

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-Subparagraph (SX 210.4-08.(h)(2))

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 47

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in the valuation allowance for deferred tax assets.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to the deduction for qualified production activities received under enacted tax laws.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the difference between statutory income tax rates in foreign jurisdictions and the domestic federal statutory income tax rate recorded during the period.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to nondeductible expenses under enacted tax laws, or differences in the methodologies used to determine expense amounts for financial statements prepared in accordance with generally accepted accounting principles, not otherwise listed in the existing taxonomy.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to all other items not otherwise listed in the existing taxonomy.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the state and local income tax expense or benefit, net of the federal tax benefit (expense) thereon, recorded during the period.

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The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate attributable to all income tax settlements during the period.

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