CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operating Activities:
Net income	$ 77,184us-gaap_NetIncomeLoss	$ 84,512us-gaap_NetIncomeLoss	$ 42,653us-gaap_NetIncomeLoss
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	0	(30,840)	0
Depreciation and amortization	38,296	29,882	24,702
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease)	7,047	1,787	(166)
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for deferred income taxes	15,948	4,111	4,970
Stock-based compensation	16,199us-gaap_ShareBasedCompensation	14,411us-gaap_ShareBasedCompensation	9,706us-gaap_ShareBasedCompensation
Write off of Deferred Debt Issuance Cost	0	14,958	813
Gross excess tax benefits from stock-based compensation	(4,943)	(5,308)	(4,638)
Workers’ compensation and medical malpractice provision	3,321	5,956	3,594
Other Noncash Income (Expense)	(1,408)us-gaap_OtherNoncashIncomeExpense	1,853us-gaap_OtherNoncashIncomeExpense	(785)us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable	(45,361)	(20,155)	(18,604)
Prepaid expenses and income taxes	(8,304)	6,628	2,166
Increase (Decrease) in Income Taxes Payable	(8,023)	(5,759)	196
Accounts payable	(1,693)	(1,580)	1,987
Accrued payroll and contract professional pay	11,275	17,554	(28,053)
Increase (Decrease) in Workers' Compensation Liabilities	(2,192)	(2,348)	(2,049)
Deferred compensation	(20)	(9,980)	312
Other	(4,120)	8,548	2,323
Net cash provided by operating activities	96,022	110,524	40,697
Cash Flows from Investing Activities:
Cash paid for property and equipment	(19,729)	(16,531)	(14,354)
Cash paid for acquisitions, net of cash acquired	0	(110,700)	(347,743)
Proceeds from Divestiture of Businesses, Net of Cash Divested	0	59,899	0
Other	169	(1,023)	(869)
Net cash used in investing activities	(19,560)	(68,355)	(362,966)
Cash Flows from Financing Activities:
Principal payments of long-term debt	(148,688)us-gaap_RepaymentsOfLongTermDebt	(456,275)us-gaap_RepaymentsOfLongTermDebt	(173,163)us-gaap_RepaymentsOfLongTermDebt
Proceeds from long-term debt	164,000	429,500	513,000
Proceeds from option exercises and employee stock purchase plan	6,358	7,054	8,384
Payment of employment taxes related to release of restricted stock awards	(6,498)us-gaap_PaymentsForOtherTaxes	(7,600)us-gaap_PaymentsForOtherTaxes	(2,627)us-gaap_PaymentsForOtherTaxes
Gross excess tax benefits from stock-based compensation	4,943	5,308	4,638
Repurchase of common stock	(100,049)	0	0
Debt issuance or amendment costs	(467)us-gaap_PaymentsOfFinancingCosts	(6,938)us-gaap_PaymentsOfFinancingCosts	(17,113)us-gaap_PaymentsOfFinancingCosts
Payments of accrued earn-outs	(691)	(3,425)	(1,198)
Other	0	(14)	(43)
Net cash provided by (used in) financing activities	(81,092)	(32,390)	331,878
Effect of exchange rate changes on cash and cash equivalents	(1,006)	92	131
Net Increase (Decrease) in Cash and Cash Equivalents	(5,636)	9,871	9,740
Cash and Cash Equivalents at Beginning of Year	37,350	27,479	17,739
Cash and Cash Equivalents at End of Year	31,714	37,350	27,479
Supplemental Disclosure of Cash Flow Information
Income taxes	56,320us-gaap_IncomeTaxesPaidNet	32,350us-gaap_IncomeTaxesPaidNet	33,915us-gaap_IncomeTaxesPaidNet
Interest	11,559us-gaap_InterestPaidNet	15,158us-gaap_InterestPaidNet	14,722us-gaap_InterestPaidNet
Non-Cash Investing and Financing Activities:
Equity consideration for acquisition	0us-gaap_StockIssued1	0us-gaap_StockIssued1	225,558us-gaap_StockIssued1
Payable for employment taxes withheld related to release of restricted stock awards	0	0	2,907
Acquisition of property and equipment through accounts payable	2,932	594	369
Acquisition accounting	$ 0	$ 0	$ (1,805)

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Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.

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The cash outflow associated with other payments to acquire businesses including deposit on pending acquisitions and preacquisition costs.

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The amount of cash paid during the current period for taxes other than income taxes.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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This element represents the cash inflow during the period from the sale of a component of the entity.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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