CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net (loss) income	$ (305,857,000)	$ (2,699,000)	$ 311,631,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	18,509,000	30,799,000	36,447,000
Amortization of right-of-use assets under operating leases	11,769,000	0	0
Amortization of intangible assets	19,021,000	28,412,000	35,367,000
Unrealized (gain) loss on investment in equity securities	(14,431,000)	12,972,000	0
Change in the fair value of acquisition related contingent consideration	0	0	24,000
Goodwill and intangible assets write-off from business exits (Note 11)	5,900,000	2,640,000	0
Share-based compensation expense	11,874,000	10,192,000	4,255,000
Bad debt expense	720,000	2,830,000	5,116,000
Gain on early extinguishment of debt	0	0	(5,637,000)
Amortization of debt discount	666,000	717,000	301,000
Amortization of debt issuance costs	736,000	965,000	833,000
Deferred income taxes	307,339,000	(5,791,000)	(297,336,000)
Loss on disposal of fixed assets	750,000	727,000	2,768,000
Gain on sale of businesses (Note 4)	(17,814,000)	(13,688,000)	0
Loss on debt refinancing (Note 14)	0	4,434,000	0
Changes in operating assets and liabilities (excludes effect of sale of businesses):
Accounts receivable	(12,207,000)	14,556,000	29,965,000
Short-term investments in real estate	39,873,000	(10,468,000)	(16,380,000)
Prepaid expenses and other current assets	13,628,000	4,617,000	(5,754,000)
Other assets	(132,000)	2,278,000	770,000
Accounts payable and accrued expenses	(16,257,000)	1,651,000	2,576,000
Current and non-current operating lease liabilities	(12,738,000)
Other current and non-current liabilities	(4,661,000)	(16,742,000)	(38,864,000)
Net cash provided by operating activities	46,688,000	68,402,000	66,082,000
Cash flows from investing activities:
Additions to premises and equipment	(2,161,000)	(3,916,000)	(10,514,000)
Proceeds from the sale of businesses (Note 4)	38,632,000	15,000,000	0
Proceeds received from sale of equity securities	7,994,000	0	0
Other investing activities	422,000	0	188,000
Net cash provided by (used in) investing activities	44,887,000	11,084,000	(10,326,000)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	0	407,880,000	0
Repayments and repurchases of long-term debt	(44,996,000)	(486,759,000)	(59,761,000)
Debt issuance costs	0	(5,042,000)	0
Proceeds from stock option exercises	400,000	3,644,000	2,374,000
Purchase of treasury shares	(19,995,000)	(40,362,000)	(39,011,000)
Distributions to non-controlling interests	(2,752,000)	(2,819,000)	(2,772,000)
Payments of tax withholding on issuance of restricted share units and restricted shares	(1,695,000)	(825,000)	(1,164,000)
Net cash used in financing activities	(69,038,000)	(124,283,000)	(100,334,000)
Net increase (decrease) in cash, cash equivalents and restricted cash	22,537,000	(44,797,000)	(44,578,000)
Cash, cash equivalents and restricted cash at the beginning of the period	64,046,000	108,843,000	153,421,000
Cash, cash equivalents and restricted cash at the end of the period	86,583,000	64,046,000	108,843,000
Supplemental cash flow information:
Interest paid	20,856,000	24,123,000	21,210,000
Income taxes paid, net	2,688,000	7,136,000	18,332,000
Acquisition of right-of-use assets with operating lease liabilities	13,775,000
Reduction of right-of-use assets from operating lease modifications or reassessments	(5,844,000)
Non-cash investing and financing activities:
Net decrease in payables for purchases of premises and equipment	$ (101,000)	$ (32,000)	$ (1,311,000)