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Supplemental Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Cash Flows
Income taxes	$ 16,926	$ 9,151	$ 6,358
Interest expense	670	524	968
Noncash investing activities:
Acquisition of property and equipment for which payment is pending	390	901	3,349
Acquisition of property and equipment through like-kind exchange of similar assets			$ 2,924

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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