Other Assets, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Assets held in Rabbi Trust	$ 33,739	$ 29,134
Right-of-use assets for operating leases, net	17,866
Equity method investment	8,641	0
Capitalized software, net	7,395	4,828
Deferred loan costs, net	943	1,182
Interest rate swap derivative instrument	0	900
Other non-current assets	1,238	620
Total Other assets, net	$ 69,822	$ 36,664