Supplemental Condensed Consolidated Cash Flow Information - Schedule of Restricted Cash Classified Within Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 335,728	$ 544,432	$ 514,857
Total restricted cash	34,344	379,494	30,554
Cash, cash equivalents, and restricted cash	370,072	923,926	545,411	$ 556,201
Escrow deposit	15,300
Current Assets
Cash and Cash Equivalents [Line Items]
Total restricted cash	15,682	361,578	13,995
Other long-term assets
Cash and Cash Equivalents [Line Items]
Total restricted cash	18,662	17,916	16,559
Consignor funds held in legally segregated accounts
Cash and Cash Equivalents [Line Items]
Total restricted cash	11,192	46,029	7,243
Funds deposited with the trustee for the redemption of the 2022 Senior Notes
Cash and Cash Equivalents [Line Items]
Total restricted cash	0	312,250	0
Cash Management Account related to the York Property Mortgage (see Note 8)
Cash and Cash Equivalents [Line Items]
Total restricted cash	4,290	3,107	6,092
Other
Cash and Cash Equivalents [Line Items]
Total restricted cash	$ 200	$ 192	$ 660