Debt (Tables)

12 Months Ended

Dec. 31, 2012

Debt [Abstract]

Summary of long-term debt and short-term debt

	2012		2011
Borrowings under our $100,000 revolving credit facility bearing interest at a floating rate equal to LIBOR (0.25% at December 31, 2012) plus an applicable margin of 1.50%, expiring October 26, 2017.	$	38,087	$	40,989
Borrowings under our $40,000 aggregate principal amount notes bearing interest at a fixed rate of 4.89% maturing on April 26, 2014. Annual principal payments of $5,714 began on April 26, 2008 and extend through the date of maturity.		11,429		17,143
Borrowings under our $20,000 aggregate principal amount notes bearing interest at a fixed rate of 4.64% maturing on December 20, 2018. Annual principal payments of $4,000 will begin on December 22, 2014 and extend through the date of maturity.		20,000		20,000
Total long-term debt		69,516		78,132
Less current maturities of long-term debt		5,801		6,503
Long-term debt, excluding current maturities	$	63,715	$	71,629

Aggregate maturities of long-term debt including current portion

Year ending December 31,
2013	$	5,801
2014		9,715
2015		4,000
2016		4,000
2017		42,000
Thereafter		4,000
Total	$	69,516

Minimum future lease payments under both capital leases together with the present value of the net minimum lease payments

Year ending December 31,
2013	$	479
2014		479
2015		479
2016		479
2017		479
Thereafter		4,855
Total minimum lease payments		7,250
Less interest included in payments above		(3,241	)
Present value of minimum lease payments	$	4,009