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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018	Jan. 01, 2017
Recent accounting pronouncements
Accumulated other comprehensive income	$ (3,282)				$ (1,609)				$ (3,282)	$ (1,609)
Retained earnings	541,890				563,593				541,890	563,593
Net cash provided by operating activities									87,903	115,865	$ 145,725
Net cash used in investing activities									(88,262)	(87,319)	(172,318)
Net cash used in financing activities									(29,908)	(55,230)	(42,101)
Additional paid-in capital	188,471				181,778				188,471	181,778
Effect of foreign currency exchange rates on cash and cash equivalents									(282)	(299)	226
Net change in total cash									(30,549)	(26,983)	(68,468)
Total cash, cash equivalents, and restricted cash, beginning of period				$ 192,907				$ 219,890	192,907	219,890	288,358
Total cash, cash equivalents, and restricted cash, end of period	162,358				192,907				162,358	192,907	219,890
Valuation allowance	39,406				31,442				39,406	31,442
Operating Expenses	$ 113,824	$ 105,368	$ 104,967	$ 101,186	97,488	$ 90,395	$ 102,035	100,266	$ 425,345	390,184	425,885
ASU 2016-01
Recent accounting pronouncements
Equity investments that do not have readily determinable fair values												$ 20,100
Equity investments												600
Restatement Adjustment | Accounting Standards Update 2016-15 and 2018-18
Recent accounting pronouncements
Net cash used in investing activities											(5,525)
Net cash used in financing activities											(1,178)
Net change in total cash											(6,703)
Total cash, cash equivalents, and restricted cash, beginning of period								11,934		11,934	18,637
Total cash, cash equivalents, and restricted cash, end of period											11,934
Restatement Adjustment | ASU 2017-07
Recent accounting pronouncements
Other Income											200
Operating Expenses											200
Previously Reported | Accounting Standards Update 2016-15 and 2018-18
Recent accounting pronouncements
Net cash provided by operating activities											145,725
Net cash used in investing activities											(166,793)
Net cash used in financing activities											(40,923)
Effect of foreign currency exchange rates on cash and cash equivalents											226
Net change in total cash											(61,765)
Total cash, cash equivalents, and restricted cash, beginning of period								$ 207,956		207,956	269,721
Total cash, cash equivalents, and restricted cash, end of period											$ 207,956
Adjustment | ASU 2016-01
Recent accounting pronouncements
Accumulated other comprehensive income												(200)
Retained earnings												$ 200
Adjustment | ASU 2016-09
Recent accounting pronouncements
Retained earnings													$ 300
Additional paid-in capital													$ (300)
Adjustment | ASU 2018-02 | Early Adoption
Recent accounting pronouncements
Accumulated other comprehensive income					(800)					(800)
Retained earnings					800					800
Valuation allowance					$ 800					$ 800

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