Accumulated Other Comprehensive Loss - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) before income taxes		$ (22,908)	$ 5,038
Income tax provision (benefit)		(7,286)	1,093
Net (loss) income		(15,622)	3,945
Reclassification out of Accumulated Other Comprehensive Income
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]
Net (loss) income	[1]	(182)	(85)
Defined Benefit Plan Items | Reclassification out of Accumulated Other Comprehensive Income
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior-service cost	[1],[2]	(89)	(136)
Income (loss) before income taxes	[1]	(89)	(136)
Income tax provision (benefit)	[1]	33	51
Net (loss) income	[1]	(56)	$ (85)
Gain on sale of investment | Reclassification out of Accumulated Other Comprehensive Income
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]
Recognition of gain on sale of investment	[1]	(200)
Income (loss) before income taxes	[1]	(200)
Income tax provision (benefit)	[1]	74
Net (loss) income	[1]	$ (126)

[1] Amounts in parentheses indicate credits to profit/loss

[2] This accumulated other comprehensive loss component is included in the computation of net periodic benefit cost (see Note 6).