STOCKHOLDERS' EQUITY - Tangible Equity Units (Details) $ / shares in Units, $ in Thousands			9 Months Ended
	Aug. 03, 2015 shares	May 21, 2014 USD ($) $ / shares shares	Sep. 30, 2016 USD ($) shares	Dec. 31, 2015 USD ($)
Class of Stock [Line Items]
Minimum settlement rate		4.4456
Market value greater or equal to (in dollars per share) | $ / shares		$ 11.247
Maximum settlement rate		5.1124
Market value less than or equal to (in dollars per share) | $ / shares		$ 9.78
Tangible equity units settled			1,337,544
Tangible equity units outstanding			42,456
Long term debt, net | $			$ 176,579	$ 261,876
Common Stock | Class A Common Stock
Class of Stock [Line Items]
Issuance of shares of voting common stock	70,690		5,946,170
Junior Subordinated Debt | 7.50% Amortizing Note Due May 15, 2017
Class of Stock [Line Items]
Tangible equity units issued during period, shares		1,380,000
Tangible equity units issued to underwriter during period, shares		180,000
Proceeds from issuance of tangible equity units, net of issuance costs | $		$ 65,000
Tangible equity units, convertible, conversion ratio		10.604556
Stated interest rate		7.50%
Equal quarterly cash installments per Amortizing Note		1.00
Installment payment due on August 15, 2014 per Amortizing Note		0.933333
Tangible equity units dividend rate		8.00%
Tangible equity units, price per share (in dollars per share) | $ / shares		$ 50.00
Junior Subordinated Debt | 7.50% Amortizing Note Due May 15, 2017 | Long Term Debt
Class of Stock [Line Items]
Long term debt, net | $			$ 3,900	$ 7,500