Debt (Tables)

6 Months Ended

Jun. 30, 2013

Debt Disclosure [Abstract]

Summary of Indebtedness outstanding

	June 30,		December 31,
	2013		2012
Short-term debt:
Bank Credit Facility, expires October 6, 2015	$	38,000	$	38,000
Long-term debt:
6.05% Senior Notes, due June 15, 2015. Aggregate     principal amount of $75,000 less unaccrued discount     of $51 and $65 (6.1% imputed rate)		74,949		74,935
6.85% Senior Notes, due April 15, 2016. Aggregate     principal amount of $125,000 less unaccrued discount     of $107 and $126 (6.9% imputed rate)		124,893		124,874
Total	$	237,842	$	237,809