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Commitments and Contingencies (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Long-term Debt |  |  |
2013 | $ 10,000,000 |  |
2014 | 10,000,000 |  |
2015 | 10,000,000 |  |
2016 | 10,875,000 |  |
2017 | 99,750,000 |  |
Thereafter | 259,188,000 |  |
Total | 399,813,000 |  |
Operating Leases |  |  |
2013 | 15,685,000 |  |
2014 | 13,863,000 |  |
2015 | 11,236,000 |  |
2016 | 7,523,000 |  |
2017 | 5,351,000 |  |
Thereafter | 8,699,000 |  |
Total | 62,357,000 |  |
Related Party |  |  |
2013 | 1,299,000 |  |
2014 | 1,168,000 |  |
2015 | 694,000 |  |
2016 | 175,000 |  |
2017 | 0 |  |
Thereafter | 0 |  |
Total | 3,336,000 |  |
Total |  |  |
2013 | 16,984,000 |  |
2014 | 15,031,000 |  |
2015 | 11,930,000 |  |
2016 | 7,698,000 |  |
2017 | 5,351,000 |  |
Thereafter | 8,699,000 |  |
Total | 65,693,000 |  |
Deferred rent liability, current | 400,000 | 300,000 |
Deferred rent liability, noncurrent | 3,600,000 | 3,800,000 |
Rent expense | 16,600,000 | 12,800,000 | 7,200,000
Workers' compensation and medical malpractice liability, current | 32,751,000 | 26,769,000 |
Letters of credit outstanding | 2,700,000 | 2,800,000 |
Business Acquisition, Contingent Consideration, Potential Cash Payment | 16,000,000 |  |
Income tax reserve in other long-term liabilities | 1,600,000 | 400,000 |
Other Liabilities, Current | 27,906,000 | 21,437,000 |
Pending Litigation [Member] |  |  |
Total |  |  |
Other Liabilities, Current | $ 2,100,000 |  |
Apex Systems |  |  |
Total |  |  |
Number of leased properties owned by related parties (in number of properties) | 2 |  |

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