STOCK-BASED AWARDS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Weighted Average Exercise Price
Stock-based compensation expense	$ 4,891,000	$ 3,526,000	$ 4,035,000
Units
Outstanding-end of period (in shares)	560,000
Stock options
Stock-Based Awards
Stock options, expiration period	10 years
Vesting period	4 years
Number of shares available for future grants	2,100,000
Options
Outstanding—beginning of year (in shares)	204,000	224,000	273,000
Exercised (in shares)	(42,000)	(16,000)	(30,000)
Expired/Forfeited (in shares)	(6,000)	(4,000)	(19,000)
Outstanding—end of year (in shares)	156,000	204,000	224,000
Options exercisable at year-end (in shares)	156,000	204,000	224,000
Weighted Average Exercise Price
Outstanding—beginning of year (in dollars per share)	$ 17.27	$ 17.27	$ 17.30
Exercised (in dollars per share)	17.08	16.94	17.08
Expired/Forfeited (in dollars per share)	17.08	18.26	18.00
Outstanding—end of year (in dollars per share)	17.33	17.27	17.27
Options exercisable at year-end (in dollars per share)	$ 17.33	$ 17.27	$ 17.27
Options Outstanding, Weighted Average Remaining Contract Life	55 days
Options Outstanding, Aggregate Intrinsic Value	$ 63,000
Options Exercisable, Weighted Average Remaining Contract Life	55 days
Options Exercisable, Aggregate Intrinsic Value	$ 63,000
Stock-based compensation expense	$ 0	$ 0	$ 0
Stock price (in dollars per share)	$ 17.50
Intrinsic value of options exercised	$ 82,000	92,000	126,000
Proceeds from exercise of employee stock options	819,000	$ 269,000	511,000
Tax benefit realized from stock-based compensation	$ 0
Stock options | First year
Weighted Average Exercise Price
Percentage of award vesting at the end of the year	28.00%
Stock options | Monthly
Weighted Average Exercise Price
Percentage of award vesting at the end of the year	2.00%
Restricted stock awards
Stock-Based Awards
Vesting period	3 years
Weighted Average Exercise Price
Percentage of award vesting at the end of the year		33.30%
Stock-based compensation expense	$ 4,900,000	$ 3,500,000	$ 4,000,000
Units
Outstanding-beginning of year (in shares)	349,000	578,000	704,000
Granted at fair value (in shares)	541,000	239,000	242,000
Vested (in shares)	(219,000)	(377,000)	(302,000)
Forfeited (in shares)	(111,000)	(91,000)	(66,000)
Outstanding-end of period (in shares)	560,000	349,000	578,000
Weighted Average Grant Date Fair Value
Outstanding-beginning of year (in dollars per share)	$ 24.80	$ 16.70	$ 10.79
Granted at fair value (in dollars per share)	14.52	24.60	28.24
Vested (in dollars per share)	22.57	12.34	11.87
Forfeited (in dollars per share)	16.52	24.35	17.70
Outstanding-end of period (in dollars per share)	$ 17.46	$ 24.80	$ 16.70
Restricted stock awards | First year
Weighted Average Exercise Price
Award vesting percentage	33.30%
Restricted stock awards | Second year
Weighted Average Exercise Price
Award vesting percentage	33.30%
Restricted stock awards | Third year
Weighted Average Exercise Price
Award vesting percentage	33.30%