Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Cash provided by operating activities	$ 21,521	$ 19,421
Cash flows from investing activities:
Acquisition of property and equipment	(3,904)	(4,140)
Proceeds from sale of short-term investments		1,018
Other investing activities	(154)	67
Net cash used in investing activities	(4,058)	(3,055)
Cash flows from financing activities:
Payments on long-term debt	(10,250)	(111,850)
Proceeds from long-term debt		92,100
Payments for debt issuance costs		(1,149)
Purchase of shares held in treasury	(80)	(117)
Net cash used in financing activities	(10,330)	(21,016)
Net increase (decrease) in cash and cash equivalents	7,133	(4,650)
Cash and cash equivalents, beginning of period	6,991	12,197
Cash and cash equivalents, end of period	$ 14,124	$ 7,547