Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended	12 Months Ended
Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impairment of goodwill	$ 15,400,000	$ 0	$ 0	$ 15,399,000
Goodwill	199,720,000	498,356,000	229,234,000	199,720,000
Long-term Debt		426,588,000
Advertising costs		5,300,000	3,200,000	3,100,000
Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value		430,000,000
Nurse Travel Division [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impairment of goodwill	15,400,000
Goodwill	15,400,000			15,400,000
Goodwill, implied fair value	$ 0			$ 0

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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+ Details

- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

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

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+ Details

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References+ Details