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Operations and Significant Accounting Policies (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |
Accumulated other comprehensive income (loss), beginning of the period | $ (55,737) |  |
Accumulated other comprehensive income (loss), end of the period | (59,277) | $ (55,737) |
Accumulated Other Comprehensive Loss [Member] |  |  |
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |
Accumulated other comprehensive income (loss), beginning of the period | (55,737) | (49,078) | $ (58,526)
Other comprehensive income (loss) before reclassifications, net of tax | 803 | (3,441) | 7,208
Amounts reclassified from accumulated other comprehensive income (loss) before tax | (5,726) | 3,602 | 3,553
Reclassification from AOCI, Current Period, Tax | 1,383 | (871) | (1,313)
Net current-period other comprehensive income (loss) | (3,540) | (710) | 9,448
Accumulated other comprehensive income (loss), end of the period | (59,277) | (55,737) | (49,078)
Cash Flow Hedging Gain (Loss) [Member] |  |  |
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |
Accumulated other comprehensive income (loss), beginning of the period | 4,085 | (3,530) | 1,546
Other comprehensive income (loss) before reclassifications, net of tax | 2,936 | 7,639 | (5,529)
Amounts reclassified from accumulated other comprehensive income (loss) before tax | (8,607) | 913 | 718
Reclassification from AOCI, Current Period, Tax | 2,079 | (221) | (265)
Net current-period other comprehensive income (loss) | (3,592) | 8,331 | (5,076)
Accumulated other comprehensive income (loss), end of the period | 493 | 4,085 | (3,530)
Pension Liability [Member] |  |  |
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |
Accumulated other comprehensive income (loss), beginning of the period | (31,718) | (25,813) | (26,458)
Other comprehensive income (loss) before reclassifications, net of tax | (2,158) | (2,711) | (1,142)
Amounts reclassified from accumulated other comprehensive income (loss) before tax | 2,881 | 2,689 | 2,835
Reclassification from AOCI, Current Period, Tax | (696) | (650) | (1,048)
Net current-period other comprehensive income (loss) | 27 | (672) | 645
Accumulated other comprehensive income (loss), end of the period | (31,691) | (31,718) | (25,813)
Cumulative Translation Adjustment [Member] |  |  |
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |
Accumulated other comprehensive income (loss), beginning of the period | (28,104) | (19,735) | (33,614)
Other comprehensive income (loss) before reclassifications, net of tax | 25 | (8,369) | 13,879
Amounts reclassified from accumulated other comprehensive income (loss) before tax | 0 | 0 | 0
Reclassification from AOCI, Current Period, Tax | 0 | 0 | 0
Net current-period other comprehensive income (loss) | 25 | (8,369) | 13,879
Accumulated other comprehensive income (loss), end of the period | $ (28,079) | (28,104) | $ (19,735)
Accounting Standards Update 2018-02 [Member] | Accumulated Other Comprehensive Loss [Member] |  |  |
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | (5,949) |
Accounting Standards Update 2018-02 [Member] | Cash Flow Hedging Gain (Loss) [Member] |  |  |
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | (716) |
Accounting Standards Update 2018-02 [Member] | Pension Liability [Member] |  |  |
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ (5,233) |

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