CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net income (loss)	$ (157,693)	$ 47,330	$ 10,374
Adjustments to reconcile net income to net cash provided by operating activities, net of business acquisitions:
Depreciation and amortization	49,988	52,756	49,289
Gain on sale of investment	0	(1,163)	(2,581)
Impairment loss	183,288	0	0
Amortization of deferred loan costs	1,894	1,827	1,518
Share-based employee compensation expense	9,246	11,450	10,213
Excess tax benefits from share-based payment arrangements	(433)	(1,067)	(381)
(Increase) decrease in accounts receivable, net	(7,452)	12,207	14,352
Decrease (increase) in other current assets	6,960	(159)	(1,972)
Increase (decrease) in accounts payable	1,466	(2,256)	6,565
(Decrease) increase in accrued salaries and benefits	(8,932)	(19,715)	24,991
Increase (decrease) in other current liabilities	2,676	(45,206)	(11,067)
Deferred income taxes	(3,572)	16,682	8,076
Other	(1,144)	201	3,491
Net cash flows provided by operating activities	76,292	72,887	112,868
Cash flows from investing activities:
Acquisition of property and equipment	(49,290)	(44,431)	(49,110)
Sale of investment	0	1,163	11,626
Business acquisitions, net of cash acquired, and equity investments	(23,523)	0	(19,486)
Other	(6,889)	(5,581)	(5,456)
Net cash flows used in investing activities	(79,702)	(48,849)	(62,426)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	439,621	656,997	405,400
Deferred loan costs	0	(3,219)	(784)
Repurchases of common stock	(23,690)	(4,494)	0
Repurchase of stock options	0	0	(736)
Excess tax benefits from share-based payment arrangements	433	1,067	381
Exercise of stock options	4,825	1,133	727
Payments of long-term debt	(417,490)	(673,188)	(457,303)
Change in outstanding checks and other	(709)	(3,717)	(1,113)
Net cash flows provided by (used in) financing activities	2,990	(25,421)	(53,428)
Effect of exchange rate changes on cash	220	91	185
Net decrease in cash and cash equivalents	(200)	(1,292)	(2,801)
Cash and cash equivalents, beginning of period	1,064	2,356	5,157
Cash and cash equivalents, end of period	864	1,064	2,356
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	11,106	12,137	12,717
Cash paid during the period for income taxes	7,874	13,231	18,390
Noncash Activities:
Assets acquired through capital lease obligations	0	8,435	0
Issuance of unregistered common stock associated with Navvis acquisition	$ 3,262	$ 0	$ 0