Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, at beginning of year	$ (11,300)		$ 10,220
Net unrealized gains (losses) arising during the period	(15,040)		(17,300)
Less: Net realized gains reclassified to net income	(1,940)		(4,090)
Other Comprehensive Income (Loss)	(13,100)		(13,210)		$ (17,610)
Accumulated Other Comprehensive Income (Loss), Attributed to Spin-off			(8,310)
Balance, at end of year	(24,400)		(11,300)		10,220
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Net of Tax	250		1,810		(3,340)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(730)		(2,650)		(450)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(12,620)		(12,370)		(13,820)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, before Reclassification Adjustments, Tax	300		400
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	700		1,900
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax	700		1,800
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	300		300
Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, at beginning of year	(12,370)		(14,180)
Net unrealized gains (losses) arising during the period	(1,270)	[1]	(1,320)	[2]
Less: Net realized gains reclassified to net income	(1,520)	[3]	(3,130)	[4]
Accumulated Other Comprehensive Income (Loss), Attributed to Spin-off			0
Balance, at end of year	(12,120)		(12,370)		(14,180)
Derivative Instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, at beginning of year	(1,790)		610
Net unrealized gains (losses) arising during the period	(1,150)	[1]	(3,610)	[2]
Less: Net realized gains reclassified to net income	(420)	[3]	(960)	[4]
Accumulated Other Comprehensive Income (Loss), Attributed to Spin-off			250
Balance, at end of year	(2,520)		(1,790)		610
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, at beginning of year	2,860		23,790
Net unrealized gains (losses) arising during the period	(12,620)		(12,370)
Less: Net realized gains reclassified to net income	0		0
Accumulated Other Comprehensive Income (Loss), Attributed to Spin-off			(8,560)
Balance, at end of year	$ (9,760)		$ 2,860		$ 23,790

[1] Defined benefit plans, net of income tax of $0.3 million. See Note 15, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax of $0.7 million. See Note 12, "Derivative Instruments," for further details.

[2] Defined benefit plans, net of income tax of $0.4 million. See Note 15, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax expense of $1.9 million. See Note 12, "Derivative Instruments," for further details.

[3] Defined benefit plans, net of income tax of $0.7 million. See Note 15, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax of $0.3 million. See Note 12, "Derivative Instruments," for further details

[4] Defined benefit plans, net of income tax of $1.8 million. See Note 15, "Employee Benefit Plans," for additional details. Derivative instruments, net of income tax expense of $0.3 million. See Note 12, "Derivative Instruments," for further details.