STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2016

STOCK-BASED COMPENSATION

Summary of restricted stock units, performance-based stock units, and weighted average grant date fair values

	Employee Service-Based Awards				Employee Performance- Based Awards				Director Awards
	Units		Weighted Average Grant Date Fair Value		Units		Weighted Average Grant Date Fair Value		Units		Weighted Average Grant Date Fair Value
Nonvested at December 31, 2014	670,735		$	28.99	75,661		$	24.70	72,832		$	29.46
Granted	474,108		24.48		120,178		25.95		92,155		14.46
Vested	(281,587	)	27.46		(49,775	)	24.37		(56,797	)	26.17
Forfeited	(52,416	)	28.73		(613	)	29.66		(14,021	)	19.48
Nonvested at December 31, 2015	810,840		26.90		145,451		25.83		94,169		18.25
Granted	631,011		6.90		192,600		6.90		71,000		6.53
Vested	(279,421	)	26.64		(19,722	)	23.99		(93,704	)	18.16
Forfeited	(95,832	)	20.69		(192,600	)	6.90		—		—
Nonvested at December 31, 2016	1,066,598		$	16.30	125,729		$	26.11	71,465		$	6.72

Summary of option activity and weighted average exercise prices

(dollars in thousands)	Director Awards
Weighted Average Exercise Price	Shares		Weighted Average Exercise Price		Aggregate Intrinsic Value		Weighted Average Remaining Contractual Term (Years)
Outstanding at December 31, 2014	7,947		$	5.09	$	—	—
Exercised	(7,947	)	5.09		—		—
Outstanding at December 31, 2015	—		$	—	$	—	—