COMMITMENTS (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Future minimum payments under operating lease agreements
2015	$ 32,255,000
2016	31,105,000
2017	26,723,000
2018	23,338,000
2019	17,775,000
Thereafter	191,108,000
Total	322,304,000
Expenses charged to operations under operating lease agreements	$ 41,200,000	$ 36,700,000	$ 30,600,000
Period of most significant operating leases (in years)	77 years
Percentage of most significant operating leases	55.00%