Other Current Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011
Payables and Accruals [Abstract]
Accrued postretirement benefits	$ 625				$ 798
Accrued workers’ compensation liabilities	1,496				1,244
Short-term pension liabilities	347				686
Other (including net taxes payable)	2,703				2,568
Other current liabilities	$ 5,171	$ 6,728	$ 5,242	$ 5,268	$ 5,296	$ 5,287	$ 4,276	$ 4,063	$ 4,527