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 loss	$ (1,702)	$ (3,622)	$ (69,725)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	40,426	33,969	32,496
Loss on disposal of property and equipment, net	37	116	26
Impairment of capitalized software	526
Impairment of goodwill and other intangible assets			55,647
Stock-based compensation expense	3,983	4,631	5,613
Equity in (earnings) of equity-method investment, net of taxes	(475)	(396)	(15)
Provision for doubtful accounts	1,082	1,253	2,711
Non-cash changes in deferred rent	(555)	237	2,303
Deferred income taxes	(5,734)	471	(459)
Other, net	1,307	630	178
Changes in operating assets and liabilities:
Accounts receivable	(1,186)	(156)	7,238
Prepaid expenses, deposits and other assets	(2,282)	(2,577)	2,205
Accounts payable	(5,209)	8,147	(2,405)
Accrued liabilities	(247)	(1,216)	1,436
Deferred revenues	(970)	(907)	351
Accrued restructuring liability	(371)	(978)	(80)
Net cash flows provided by operating activities	28,630	39,602	37,520
Cash Flows from Investing Activities:
Purchases of property and equipment	(68,596)	(62,235)	(17,278)
Proceeds from disposal of property and equipment	54	51	4
Voxel acquisition, net of cash received	(27,723)
Maturities of investments in marketable securities		7,000	7,374
Net cash flows used in investing activities	(96,265)	(55,184)	(9,900)
Cash Flows from Financing Activities:
Proceeds from credit agreements	39,853	78,036	78,500
Principal payments on credit agreements	(1,000)	(78,750)	(78,500)
Payments of debt issuance costs	(253)	(518)
Payments on capital lease obligations	(1,190)	(446)	(276)
Proceeds from exercise of stock options	1,372	3,420	147
Tax withholdings related to net share settlements of restricted stock awards	(746)	(393)	(352)
Other, net	(135)	(125)	(117)
Net cash flows provided by (used in) financing activities	37,901	1,224	(598)
Effect of exchange rates on cash and cash equivalents	(76)	14	34
Net (decrease) increase in cash and cash equivalents	(29,810)	(14,344)	27,056
Cash and cash equivalents at beginning of period	59,582	73,926	46,870
Cash and cash equivalents at end of period	29,772	59,582	73,926
Supplemental disclosure of cash flow information:
Cash paid for interest	3,293	2,058	795
Cash paid for income taxes	267	395	681
Non-cash acquisition of property and equipment under capital leases	19,565	16,783
Capitalized stock-based compensation	$ 516	$ 178	$ 24