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Operations and Significant Accounting Policies (Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period $ (39,822)    
Tax expense (benefit) (14,646) $ (14,483) $ (14,693)
Accumulated other comprehensive income (loss), end of the period (53,894) (39,822)  
Accumulated Other Comprehensive Loss [Member]      
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period (39,822) (17,572) (27,581)
Other comprehensive income (loss) before reclassifications (9,554) (20,559) 7,267
Amounts reclassified from accumulated other comprehensive income (loss) before tax [1] (7,166) (2,683) 4,349
Tax expense (benefit) 2,648 992 (1,607)
Net current-period other comprehensive income (loss) (14,072) (22,250) 10,009
Accumulated other comprehensive income (loss), end of the period (53,894) (39,822) (17,572)
Cash Flow Hedging Gain (Loss) [Member]      
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period 3,276 (1,385) (1,130)
Other comprehensive income (loss) before reclassifications 4,482 5,061 (158)
Amounts reclassified from accumulated other comprehensive income (loss) before tax [1] (10,399) (635) (153)
Tax expense (benefit) 3,842 235 56
Net current-period other comprehensive income (loss) (2,075) 4,661 (255)
Accumulated other comprehensive income (loss), end of the period 1,201 3,276 (1,385)
Pension Liability [Member]      
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period (30,760) (18,918) (30,375)
Other comprehensive income (loss) before reclassifications 2,739 (10,551) 8,618
Amounts reclassified from accumulated other comprehensive income (loss) before tax [1] 3,233 (2,048) 4,502
Tax expense (benefit) (1,194) 757 (1,663)
Net current-period other comprehensive income (loss) 4,778 (11,842) 11,457
Accumulated other comprehensive income (loss), end of the period (25,982) (30,760) (18,918)
Cumulative Translation Adjustment [Member]      
Accumulated other comprehensive income (loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning of the period (12,338) 2,731 3,924
Other comprehensive income (loss) before reclassifications (16,775) (15,069) (1,193)
Amounts reclassified from accumulated other comprehensive income (loss) before tax [1] 0 0 0
Tax expense (benefit) 0 0 0
Net current-period other comprehensive income (loss) (16,775) (15,069) (1,193)
Accumulated other comprehensive income (loss), end of the period $ (29,113) $ (12,338) $ 2,731
[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 13 and Note 9, respectively, for further details.