Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Schedule of Amounts Reclassified out of Each Component of Accumulated Other Comprehensive Loss

	Three months ended June 30,						Six months ended June 30,
	2015			2014			2015			2014
Amounts recognized as a component of net periodic pension and other postretirement benefit cost:
Amortization of net loss	$	(6,379	)	$	(4,850	)	$	(12,688	)	$	(9,661	)
Amortization of prior service credit	1,126			1,128			2,241			2,248
Total before income taxes	(5,253		)	(3,722		)	(10,447		)	(7,413		)
Income tax benefit	1,840			1,298			3,648			2,585
Total reclassifications for the period, net of income taxes	$	(3,413	)	$	(2,424	)	$	(6,799	)	$	(4,828	)