Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating Activities:
Net income (loss)	$ 4,071	$ (1,243)
Noncash items included in net income (loss):
Depreciation and amortization	17,376	18,527
Other, net	927	1,797
Changes in operating assets and liabilities, net	(11,663)	(14,032)
Net cash provided by operating activities	10,711	5,049
Investing Activities:
Acquisition of property and equipment	(20,893)	(560)
Proceeds from disposal of property and equipment	275	337
Net cash used in investing activities	(20,618)	(223)
Financing Activities:
Proceeds from stock option exercises	149	57
Repayment of long-term debt	(8,571)
Net cash (used in) provided by financing activities	(8,422)	57
Net (Decrease) Increase in Cash and Cash Equivalents	(18,329)	4,883
Cash and cash equivalents, beginning of period	29,045	8,746
Cash and cash equivalents, end of period	$ 10,716	$ 13,629