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Workers' Compensation Claims (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Summarizes aggregate workers' compensation reserve activity |  |  |
Workers' compensation claims liabilities, Beginning balance | $ 51,193 | $ 39,302 | $ 35,958
Claims expense accrual: |  |  |
Current year | 38,386 | 26,161 | 16,850
Prior years | 12,352 | 9,978 | 880
Total expense accrual | 50,738 | 36,139 | 17,730
Claim payments related to: |  |  |
Current year | 6,746 | 5,565 | 3,814
Prior years | 24,613 | 18,683 | 10,572
Total paid | 31,359 | 24,248 | 14,386
Workers' compensation claims liabilities, Ending balance | 70,564 | 51,193 | 39,302
Incurred but not reported (IBNR) | $ 47,992 | $ 37,335 | $ 27,163

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- Definition Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 + Details
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