Lease Commitments - Schedule of lease cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Straight-line rent expense	$ 10,009	$ 8,798	$ 5,544
Variable rent expense	8,996	7,234	7,566
Capitalized rent cost	$ 12,889	$ 2,296	$ 2,003