Long-Term Debt and Borrowings Under Short-Term Credit Agreements (Tables)

12 Months Ended

Dec. 31, 2012

Debt Disclosure [Abstract]

Schedule of Debt

	December 31,
Long-term Debt	2012			2011
Variable-rate lease arrangement, secured by facilities	$	—		$	27,715
6.59% senior note, unsecured, due in semiannual installments of $3,750 beginning in    October 2003 through April 2013	3,750			11,250
6.65% senior note, unsecured, due in annual installments of $3,636 beginning in June 2003    through June 2013	3,636			7,273
2.38% to 4.97% capital leases, secured by equipment, various maturities	4,609			5,597
	$	11,995		$	51,835
Less current portion	(10,005		)	(41,490		)
Long-term Debt	$	1,990		$	10,345

Schedule of Maturities of Long-term Debt

Long-term Debt matures as follows:
2013	$	10,005
2014	1,446
2015	412
2016	132
2017	—
After 2017	—
	$	11,995