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Fair Value Measurements (Financial Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Assets:    
Investments in marketable securities $ 162,797 $ 155,846
Derivatives 3,554 7,339
Total assets 166,351 163,185
Liabilities:    
Derivatives 13,288 7,217
Level 1    
Assets:    
Investments in marketable securities 99,888 64,100
Derivatives 0 0
Total assets 99,888 64,100
Liabilities:    
Derivatives 13,252 7,263
Level 2    
Assets:    
Investments in marketable securities 62,909 91,746
Derivatives 3,022 1,985
Total assets 65,931 93,731
Liabilities:    
Derivatives 36 26
Level 3    
Assets:    
Investments in marketable securities 0 0
Derivatives 532 5,354
Total assets 532 5,354
Liabilities:    
Derivatives $ 0 $ (72)