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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly financial information
Total revenues	$ 143,482	$ 143,865	$ 138,559	$ 133,037	$ 132,546	$ 132,096	$ 126,526	$ 118,871	$ 558,943	$ 510,039	$ 444,521
Total operating expenses	87,971	91,586	91,025	92,646	90,848	92,585	93,509	90,145	363,228	367,087	336,633
Net (loss) income attributable to the company	$ 39,547	$ 37,297	$ 32,458	$ 24,986	$ 26,847	$ 24,884	$ 20,424	$ 15,750	$ 134,288	$ 87,905	$ 77,712
Basic - as reported (in dollars per share)	$ 0.22	$ 0.21	$ 0.18	$ 0.14	$ 0.13	$ 0.13	$ 0.11	$ 0.08	$ 0.74	$ 0.45	$ 0.43
Diluted - as reported (in dollars per share)	$ 0.22	$ 0.21	$ 0.18	$ 0.14	$ 0.13	$ 0.13	$ 0.11	$ 0.08	$ 0.74	$ 0.45	$ 0.42

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Total costs of sales and operating expenses for the period.

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