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Operations and Significant Accounting Policies (Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period $ (58,526)    
Accumulated other comprehensive income (loss), end of the period (49,078) $ (58,526)  
Accumulated Other Comprehensive Loss [Member]      
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period (58,526) (53,894) $ (39,822)
Other comprehensive income (loss) before reclassifications, net of tax 7,208 (5,642) (9,554)
Amounts reclassified from accumulated other comprehensive income (loss) before tax [1] 3,553 1,601 (7,166)
Reclassification from AOCI, Current Period, Tax (1,313) (591) 2,648
Net current-period other comprehensive income (loss) 9,448 (4,632) (14,072)
Accumulated other comprehensive income (loss), end of the period (49,078) (58,526) (53,894)
Cash Flow Hedging Gain (Loss) [Member]      
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period 1,546 1,201 3,276
Other comprehensive income (loss) before reclassifications, net of tax (5,529) 1,088 4,482
Amounts reclassified from accumulated other comprehensive income (loss) before tax [1] 718 (1,179) (10,399)
Reclassification from AOCI, Current Period, Tax (265) 436 3,842
Net current-period other comprehensive income (loss) (5,076) 345 (2,075)
Accumulated other comprehensive income (loss), end of the period (3,530) 1,546 1,201
Pension Liability [Member]      
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period (26,458) (25,982) (30,760)
Other comprehensive income (loss) before reclassifications, net of tax (1,142) (2,229) 2,739
Amounts reclassified from accumulated other comprehensive income (loss) before tax [1] 2,835 2,780 3,233
Reclassification from AOCI, Current Period, Tax (1,048) (1,027) (1,194)
Net current-period other comprehensive income (loss) 645 (476) 4,778
Accumulated other comprehensive income (loss), end of the period (25,813) (26,458) (25,982)
Cumulative Translation Adjustment [Member]      
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period (33,614) (29,113) (12,338)
Other comprehensive income (loss) before reclassifications, net of tax 13,879 (4,501) (16,775)
Amounts reclassified from accumulated other comprehensive income (loss) before tax [1] 0 0 0
Reclassification from AOCI, Current Period, Tax 0 0 0
Net current-period other comprehensive income (loss) 13,879 (4,501) (16,775)
Accumulated other comprehensive income (loss), end of the period $ (19,735) $ (33,614) $ (29,113)
[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.