Operations and Significant Accounting Policies (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss), beginning of the period		$ (53,894)
Income tax provision (benefit)		(4,711)	$ (14,646)	$ (14,483)
Accumulated other comprehensive income (loss), end of the period		(58,526)	(53,894)
Accumulated Other Comprehensive Loss [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss), beginning of the period		(53,894)	(39,822)	(17,572)
Other comprehensive income (loss) before reclassifications, net of tax		(5,642)	(9,554)	(20,559)
Amounts reclassified from accumulated other comprehensive income (loss) before tax	[1]	1,601	(7,166)	(2,683)
Income tax provision (benefit)		(591)	2,648	992
Net current-period other comprehensive income (loss)		(4,632)	(14,072)	(22,250)
Accumulated other comprehensive income (loss), end of the period		(58,526)	(53,894)	(39,822)
Cash Flow Hedging Gain (Loss) [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss), beginning of the period		1,201	3,276	(1,385)
Other comprehensive income (loss) before reclassifications, net of tax		1,088	4,482	5,061
Amounts reclassified from accumulated other comprehensive income (loss) before tax	[1]	(1,179)	(10,399)	(635)
Income tax provision (benefit)		436	3,842	235
Net current-period other comprehensive income (loss)		345	(2,075)	4,661
Accumulated other comprehensive income (loss), end of the period		1,546	1,201	3,276
Pension Liability [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss), beginning of the period		(25,982)	(30,760)	(18,918)
Other comprehensive income (loss) before reclassifications, net of tax		(2,229)	2,739	(10,551)
Amounts reclassified from accumulated other comprehensive income (loss) before tax	[1]	2,780	3,233	(2,048)
Income tax provision (benefit)		(1,027)	(1,194)	757
Net current-period other comprehensive income (loss)		(476)	4,778	(11,842)
Accumulated other comprehensive income (loss), end of the period		(26,458)	(25,982)	(30,760)
Cumulative Translation Adjustment [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Accumulated other comprehensive income (loss), beginning of the period		(29,113)	(12,338)	2,731
Other comprehensive income (loss) before reclassifications, net of tax		(4,501)	(16,775)	(15,069)
Amounts reclassified from accumulated other comprehensive income (loss) before tax	[1]	0	0	0
Income tax provision (benefit)		0	0	0
Net current-period other comprehensive income (loss)		(4,501)	(16,775)	(15,069)
Accumulated other comprehensive income (loss), end of the period		$ (33,614)	$ (29,113)	$ (12,338)

[1] The cash flow hedging gain (loss) and pension liability accumulated other comprehensive income components are included in sales or cost of sales and as a component of net periodic pension cost, respectively. Refer to Note 14 and Note 10, respectively, for further details.