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Commitments and Contingencies - Minimum Lease Payments (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2018	$ 38,357
2019	34,587
2020	32,552
2021	30,673
2022	28,985
Thereafter	243,242
Total minimum lease payments	408,396
Less: sublease rentals	(8,005)
Future minimum payments, net	$ 400,391

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