Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2015

Equity [Abstract]

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

	Three months ended September 30,						Nine months ended September 30,
	2015			2014			2015			2014
Amounts recognized as a component of net periodic pension and other postretirement benefit cost:
Amortization of net loss	$	(6,450	)	$	(4,909	)	$	(19,138	)	$	(14,570	)
Amortization of prior service credit	1,140			1,142			3,381			3,390
Total before income taxes	(5,310		)	(3,767		)	(15,757		)	(11,180		)
Income tax benefit	1,854			1,314			5,502			3,899
Total reclassifications for the period, net of income taxes	$	(3,456	)	$	(2,453	)	$	(10,255	)	$	(7,281	)