Fair Value Measurement (Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	$ 295,051	$ 191,214
Marketable securities	39,699	4,448
Derivatives	1,366	1,884
Interest Rate Swap
Liabilities, Fair Value Disclosure [Abstract]
Derivatives	3,007	1,966
Foreign currency derivatives
Liabilities, Fair Value Disclosure [Abstract]
Derivatives	3,568	1,888
Level I
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	295,051	191,214
Marketable securities	39,699	4,448
Derivatives	0	0
Level I | Interest Rate Swap
Liabilities, Fair Value Disclosure [Abstract]
Derivatives	0	0
Level I | Foreign currency derivatives
Liabilities, Fair Value Disclosure [Abstract]
Derivatives	0	0
Level II
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	0	0
Marketable securities	0	0
Derivatives	1,366	1,884
Level II | Interest Rate Swap
Liabilities, Fair Value Disclosure [Abstract]
Derivatives	3,007	1,966
Level II | Foreign currency derivatives
Liabilities, Fair Value Disclosure [Abstract]
Derivatives	3,568	1,888
Level III
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	0	0
Marketable securities	0	0
Derivatives	0	0
Level III | Interest Rate Swap
Liabilities, Fair Value Disclosure [Abstract]
Derivatives	0	0
Level III | Foreign currency derivatives
Liabilities, Fair Value Disclosure [Abstract]
Derivatives	$ 0	$ 0