SHAREHOLDERS' EQUITY (Details) - USD ($)	1 Months Ended	12 Months Ended
	Nov. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Feb. 26, 2016	Jan. 14, 2016	Nov. 12, 2015	May 07, 2014	Jan. 11, 2010
Common stock issuance price for equity offering							$ 115.00
Proceeds from equity offering, net of offering costs	$ 91,500,000		$ 91,462,000
Equity offering underwriting discounts	5,900,000
Equity offering expenses	$ 700,000
Weighted average shares outstanding:
Weighted average basic common shares (in shares)		11,812,000	11,516,000	11,188,000
Effect of stock options (in shares)		886,000	866,000	0
Effect of dilutive share awards (in shares)		75,000	159,000	0
Weighted average diluted common shares (in shares)		12,773,000	12,541,000	11,188,000
Additional disclosure
Potentially dilutive securities included in the denominator for computing diluted loss per share				0
Anti-dilutive securities excluded from calculation of diluted earnings per share				700,000
Common Stock Repurchases
Value of common stock authorized to be repurchased					$ 40,000,000.0	$ 50,000,000.0		$ 10,000,000.0	$ 10,000,000
Purchase of treasury stock (in shares)		690,218	5,250	99,345
Value of treasury stock acquired		$ 48,524,000	$ 218,000	$ 2,610,000
Remaining authorized repurchase amount		$ 48,700,000
Common Stock
Issuance of stock for equity offering (in shares)	852,500		853,000
Proceeds from equity offering, net of offering costs			$ 9,000