EARNINGS PER COMMON SHARE Anti-dulitve Securities excluded from Calculation (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share
Net income attributable to common stockholders	$ 36,710,000	$ 25,749,000	$ 19,513,000
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share
Anti-dilutive shares excluded from the computation of earnings per share	54,000	46,000	27,000
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Net income attributable to common stockholders		$ 0
Anti-dilutive shares excluded from the computation of earnings per share	0		60,000