COMMITMENTS AND CONTINGENCIES (Details)-K (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
COMMITMENTS AND CONTINGENCIES
Amount of outstanding letters of credit and surety bonds	$ 53,700,000	$ 58,700,000
Contractual rental expense, including participation rent	7,300,000	6,300,000	5,400,000
Ground lease payments
2015	8,151,000
2016	9,308,000
2017	9,687,000
2018	7,717,000
2019	7,933,000
Subsequent/Other	329,233,000
Total	$ 372,029,000