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EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
EARNINGS PER SHARE
Net income	$ 13,265us-gaap_NetIncomeLoss	$ 8,230us-gaap_NetIncomeLoss	$ 9,150us-gaap_NetIncomeLoss	$ 9,808us-gaap_NetIncomeLoss	$ 10,295us-gaap_NetIncomeLoss	$ 10,204us-gaap_NetIncomeLoss	$ 14,267us-gaap_NetIncomeLoss	$ 137,309us-gaap_NetIncomeLoss	$ 40,453us-gaap_NetIncomeLoss	$ 172,075us-gaap_NetIncomeLoss	$ 47,421us-gaap_NetIncomeLoss
Weighted average shares outstanding - basic									37,366,000	41,961,000	41,720,000
SHARE-BASED COMPENSATION
Dilutive effect of Treasury warrants (in shares)										14,000	22,000
Weighted average shares outstanding - diluted									37,937,000	42,317,000	42,084,000
Basic earnings per share (in dollars per share)	$ 0.37us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.25us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.24us-gaap_EarningsPerShareBasic	$ 0.24us-gaap_EarningsPerShareBasic	$ 0.34us-gaap_EarningsPerShareBasic	$ 3.28us-gaap_EarningsPerShareBasic	$ 1.08us-gaap_EarningsPerShareBasic	$ 4.10us-gaap_EarningsPerShareBasic	$ 1.14us-gaap_EarningsPerShareBasic
Diluted earnings per share (in dollars per share)	$ 0.37us-gaap_EarningsPerShareDiluted	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.25us-gaap_EarningsPerShareDiluted	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.24us-gaap_EarningsPerShareDiluted	$ 0.24us-gaap_EarningsPerShareDiluted	$ 0.34us-gaap_EarningsPerShareDiluted	$ 3.25us-gaap_EarningsPerShareDiluted	$ 1.07us-gaap_EarningsPerShareDiluted	$ 4.07us-gaap_EarningsPerShareDiluted	$ 1.13us-gaap_EarningsPerShareDiluted
Antidilutive securities excluded from the dilutive share calculation (in shares)									13,510	24,526	316,188
Stock Option
SHARE-BASED COMPENSATION
Dilutive effect of share-based compensation arrangements									571,000	341,000	278,000
Restricted Stock Awards and Units
SHARE-BASED COMPENSATION
Dilutive effect of share-based compensation arrangements										1,000	64,000