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Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Income Tax Disclosure [Abstract] |  |  |  |
Income tax expense | $ 34,784 | $ 20,121 | $ 155,283 | $ 70,989
Effective tax rate | 37.00% | 36.00% | 38.00% | 37.00%
Federal statutory rate |  |  | 35.00% | 35.00%
State income tax expense | 1,083 | 1,147 | 7,792 | 4,210
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 11,204 |  | 11,237 | 1,544
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | 1,784 | (570) | 4,172 | (2,370)
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 22,000 |  | 22,000 |
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation |  |  | 4,920 |
Second component of tax deductible goodwill, net of tax |  |  | 1,210 |
Tax Adjustments, Settlements, and Unusual Provisions |  |  | $ 447 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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