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Shareholders' Equity Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | $ 800,815 | $ 734,048
OCI before reclassifications | (24,629) | (1,848)
Amounts reclassified from AOCI | (582) | 68
Total other comprehensive income (loss), net of tax | (25,211) | (1,780)
Ending balance | 795,495 | 732,031
Parent [Member] |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | 776,538 | 712,663
Total other comprehensive income (loss), net of tax | (25,211) | (1,780)
Ending balance | 770,740 | 709,405
Foreign Currency Translation Adjustments |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | (157,999) | (157,489)
OCI before reclassifications | (25,445) | (2,386)
Amounts reclassified from AOCI | 0 | 0
Total other comprehensive income (loss), net of tax | (25,445) | (2,386)
Ending balance | (183,444) | (159,875)
Net Unrealized Gain (Loss) on Derivative Instruments |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | (723) | 1,201
OCI before reclassifications | 282 | 211
Amounts reclassified from AOCI | (1,049) | (76)
Total other comprehensive income (loss), net of tax | (767) | 135
Ending balance | (1,490) | 1,336
Net Unrealized Gain (Loss) on Nonderivative Instruments |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | (14,380) | (14,380)
OCI before reclassifications | 0 | 0
Amounts reclassified from AOCI | 0 | 0
Total other comprehensive income (loss), net of tax | 0 | 0
Ending balance | (14,380) | (14,380)
Pension Benefit Obligation Adjustments |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | (31,570) | (25,637)
OCI before reclassifications | 534 | 327
Amounts reclassified from AOCI | 467 | 144
Total other comprehensive income (loss), net of tax | 1,001 | 471
Ending balance | (30,569) | (25,166)
Accumulated Other Comprehensive Income (Loss) |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | (204,672) | (196,305)
Ending balance | $ (229,883) | $ (198,085)

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