Summary of Significant Accounting Policies (Schedule of AOCI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Increase (Decrease) in Accumulated Other Comprehensive Income [Rollforward]
Balance at beginning of period	$ (11,856)	$ (7,524)
Other comprehensive income before reclassifications	(2,164)	(6,689)
Amounts reclassified from accumulated other comprehensive loss, net of tax	1,240	2,357
Net current period other comprehensive loss, net	(924)	(4,332)
Accumulated other comprehensive loss	(12,780)	(11,856)
Income tax benefit	(728)	(1,209)
Pension and postretirement benefits
Increase (Decrease) in Accumulated Other Comprehensive Income [Rollforward]
Balance at beginning of period	(11,891)	(9,280)
Other comprehensive income before reclassifications	(1,317)	(4,968)
Amounts reclassified from accumulated other comprehensive loss, net of tax	1,240	2,357
Net current period other comprehensive loss, net	(77)	(2,611)
Accumulated other comprehensive loss	(11,968)	(11,891)
Income tax benefit	(728)	(1,209)
Foreign currency
Increase (Decrease) in Accumulated Other Comprehensive Income [Rollforward]
Balance at beginning of period	35	1,756
Other comprehensive income before reclassifications	(847)	(1,721)
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0
Net current period other comprehensive loss, net	(847)	(1,721)
Accumulated other comprehensive loss	(812)	35
Income tax benefit	$ 0	$ 0