Summary of Significant Accounting Policies - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Maturities of lease liabilities:
2020 (excluding the six months ended June 30, 2020)	$ 10,598		$ 10,598
2021	19,113		19,113
2022	16,138		16,138
2023	13,767		13,767
2024	12,294		12,294
Thereafter	46,744		46,744
Total Lease Payments	118,654		118,654
Less-Present Value Discount	(18,200)		(18,200)
Present Value of Lease Liabilities	100,454		100,454		$ 86,713
Supplemental information related to leases:
Cash paid for amounts included in the measurement of lease liabilities	5,305	$ 4,095	9,778	$ 7,873
Lease right-of-use assets obtained in exchange for lease liabilities	$ 19,922	$ 14,223	$ 22,200	$ 14,397