Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating activities:
Net income (loss)	$ (15,600)	$ 3,477
Adjustments to reconcile net income to net cash provided by (used in) operating activities, net of the effect of acquisitions:
Depreciation and amortization	5,812	5,867
Loss on disposal of fixed assets	102
Lease incentives	2,223
Provision for doubtful accounts and other adjustments to accounts receivable	308	705
Provision for excess and obsolete inventory	63	93
Excess tax benefits from stock-based compensation	(157)	(574)
Non-cash compensation related to stock options and restricted stock	3,976	4,668
Change in operating accounts, net of effect from acquisitions:
Accounts receivable	17,433	(1,879)
Income tax receivable	(176)
Deferred taxes	(10,613)	3
Inventories	(19)	(87)
Prepaid expenses and other assets	(786)	146
Accounts payable and accrued liabilities	(2,316)	(418)
Net cash provided by operating activities	250	12,001
Investing activities:
Acquisitions, net of cash received		(532)
Capital expenditures	(11,332)	(3,305)
Sale (purchase) of short-term investments	9,809	(10,327)
Net cash used in investing activities	(1,523)	(14,164)
Financing activities:
Excess tax benefits from stock-based compensation	157	574
Cash received from stock sale for employee stock purchase plan	345
Cash received from exercise of stock options	12	260
Net cash provided by financing activities	514	834
Net decrease in cash and cash equivalents	(759)	(1,329)
Cash and cash equivalents, beginning of period	17,856	14,577
Cash and cash equivalents, end of period	17,097	13,248
Supplemental disclosures of cash flow information:
Cash paid for income taxes	$ 262	$ 2,591