Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 15,133	$ 43,263
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization, net	36,677	41,630
Impairment losses	271	764
Unrealized foreign currency transaction (gains) losses, net	(646)	1,743
Stock-based compensation expense	3,111	3,411
Deferred income tax provision (benefit)	(3,981)	(3,830)
Net (gain) loss on disposal of property and equipment	83	(3,450)
Bad debt expense	806	322
Unrealized (gains) losses on financial instruments, net	(584)	273
Increase (decrease) in valuation allowance on deferred tax assets		(1,394)
Amortization of deferred loan fees	303	439
Loss on sale of discontinued operations	10,707
Other	219	331
Changes in assets and liabilities, net of acquisition:
Receivables	(9,955)	6,362
Prepaid expenses	98	(4,272)
Other current assets	5,198	(5,475)
Deferred charges and other assets	(11,568)	2,072
Accounts payable	(2,206)	(4,159)
Income taxes receivable / payable	1,950	(3,244)
Accrued employee compensation and benefits	8,842	11,615
Other accrued expenses and current liabilities	7,193	(5,211)
Deferred revenue	2,486	2,025
Other long-term liabilities	(8,803)	(3,316)
Net cash provided by operating activities	55,334	79,899
Cash flows from investing activities:
Capital expenditures	(26,355)	(21,788)
Cash paid for business acquisition, net of cash acquired	(147,094)
Proceeds from sale of property and equipment	422	3,949
Investment in restricted cash	(63)	(520)
Release of restricted cash	356
Cash divested on sale of discontinued operations	(9,100)
Other	228	1,654
Net cash (used for) investing activities	(181,606)	(16,705)
Cash flows from financing activities:
Payment of long-term debt	(10,000)
Proceeds from issuance of long-term debt	108,000
Proceeds from issuance of stock		191
Cash paid for repurchase of common stock	(7,908)	(42,677)
Proceeds from grants	88	81
Shares repurchased for minimum tax withholding on equity awards	(1,412)	(1,190)
Cash paid for loan fees related to debt	(857)
Other		(52)
Net cash provided by (used for) financing activities	87,911	(43,647)
Effects of exchange rates on cash	3,807	(4,586)
Net increase (decrease) in cash and cash equivalents	(34,554)	14,961
Cash and cash equivalents - beginning	211,122	189,829
Cash and cash equivalents - ending	176,568	204,790
Supplemental disclosures of cash flow information:
Cash paid during period for interest	1,726	787
Cash paid during period for income taxes	25,673	18,233
Non-cash transactions:
Property and equipment additions in accounts payable	3,427	1,503
Unrealized gain on postretirement obligation in accumulated other comprehensive income (loss)	$ 44	$ 122