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Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Supplemental non-cash investing and financing activities:
Equipment acquired through capital leases	$ 480	$ 671
Exercise of stock options by common stock surrender	2,357	0
Supplemental cash payment information:
Interest paid	381	2,621
Income taxes paid	$ 3,537	$ 4,224

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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