EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
EARNINGS PER SHARE
Net income	$ 10,395us-gaap_NetIncomeLoss	$ 9,808us-gaap_NetIncomeLoss
Weighted average shares outstanding - basic	34,827,000	41,915,000
SHARE-BASED COMPENSATION
Weighted average shares outstanding - diluted	35,479,000	42,477,000
Basic earnings per share (in dollars per share)	$ 0.30us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic
Diluted earnings per share (in dollars per share)	$ 0.29us-gaap_EarningsPerShareDiluted	$ 0.23us-gaap_EarningsPerShareDiluted
Antidilutive securities excluded from the dilutive share calculation (in shares)	13,472	23,624
Stock Option
SHARE-BASED COMPENSATION
Dilutive effect of share-based compensation arrangements	652,000	562,000

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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