Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)
Accumulated Other Comprenhensive Income (Loss) [Roll Forward]
Beginning Balance	$ (1,815)
Ending Balance	(3,362)
Derivative Instruments [Member]
Accumulated Other Comprenhensive Income (Loss) [Roll Forward]
Beginning Balance	325
Unrealized gains (losses)	(65)
Amounts reclassified from AOCI	(240)
Ending Balance	20
Pension, Postretirement and Other Postemployment Benefits [Member]
Accumulated Other Comprenhensive Income (Loss) [Roll Forward]
Beginning Balance	(721)
Unrealized gains (losses)	0
Amounts reclassified from AOCI	(3,606)
Ending Balance	(4,327)
Available-for-Sale Securities [Member]
Accumulated Other Comprenhensive Income (Loss) [Roll Forward]
Beginning Balance	(1,419)
Unrealized gains (losses)	507
Amounts reclassified from AOCI	1,857
Ending Balance	945
AOCI Attributable to Parent [Member]
Accumulated Other Comprenhensive Income (Loss) [Roll Forward]
Beginning Balance	(1,815)
Unrealized gains (losses)	442
Amounts reclassified from AOCI	(1,989)
Ending Balance	$ (3,362)