Fair Value Measurement (Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	$ 350,294	$ 191,214
Marketable securities	43,309	4,448
Derivatives	1,955	1,884
Interest Rate Swap
Liabilities, Fair Value Disclosure [Abstract]
Derivatives	3,622	1,966
Foreign currency derivatives
Liabilities, Fair Value Disclosure [Abstract]
Derivatives	2,876	1,888
Level I
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	350,294	191,214
Marketable securities	43,309	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	1,955	1,884
Level II | Interest Rate Swap
Liabilities, Fair Value Disclosure [Abstract]
Derivatives	3,622	1,966
Level II | Foreign currency derivatives
Liabilities, Fair Value Disclosure [Abstract]
Derivatives	2,876	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