SHAREHOLDERS' EQUITY (DEFICIT) AND NONCONTROLLING INTERESTS (Details) $ / shares in Units, $ in Thousands	1 Months Ended		12 Months Ended
	Oct. 31, 2014 USD ($) $ / shares shares	Jun. 30, 2014 USD ($) shares	Dec. 31, 2015 Vote Vote / shares $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Sep. 30, 2014 $ / shares shares	Aug. 31, 2014 $ / shares shares	Mar. 31, 2014 shares	Jan. 31, 2014 shares	Dec. 31, 2013 shares	Sep. 30, 2013 shares
Capital stock
Par value (in dollars per share) | $ / shares	$ 0		$ 0	$ 0	$ 0
Authorized (in shares)			590,000,000	590,000,000	590,000,000
Common shares, issued shares			64,523,864	51,457,023
Common shares, outstanding shares			64,523,864	51,457,023
Preferred stock, shares authorized			10,000,000	10,000,000
Number of newly authorized shares issued upon conversion (in shares)	1
Termination of existing stock redemption agreement | $				$ 4,842
Payments made to repurchase common stock | $				$ 53,400
Shares outstanding (in shares)			64,523,864	51,457,023
Series Preferred Stock
Preferred stock issued (in shares)			0
Preferred stock outstanding (in shares)			0	0
Two shareholders
Capital stock
Common shares, issued shares			11,050,000
Class A Voting Common Stock
Capital stock
Authorized (in shares)									42,500,000
Total authorized (in shares)								42,500,000
Number of votes per share entitled to holders (in votes) | Vote / shares			20
Class B Nonvoting Common Stock
Capital stock
Authorized (in shares)									807,500,000
Total authorized (in shares)						372,486		807,500,000
Initial public offering price (in dollars per share) | $ / shares						$ 13.00
Termination of existing stock redemption agreement | $				$ (4,842)
Restricted common shares | $		$ 12,000
Common stock issued (in shares)		716,695
Class C Voting Common Stock
Capital stock
Total authorized (in shares)							6,222,000	2,992,000
Number of votes per share entitled to holders (in votes) | Vote / shares			1
Series A Preferred
Capital stock
Total authorized (in shares)							6,222,000	2,992,000
Common stock
Capital stock
Par value (in dollars per share) | $ / shares					$ 0
Common shares, issued shares										1
Common shares, outstanding shares	40,448,744
Number of shares sold by the Company (in shares)	11,000,000
Number of shares of stock sold by the existing shareholders (in shares)	4,333,333
Initial public offering price (in dollars per share) | $ / shares	$ 13.00
Net proceeds from initial public offering | $	$ 130,440
Underwriting discounts and commissions | $	9,652
Other offering expenses | $	$ 2,908
Number of newly authorized shares issued upon conversion (in shares)	1
Contributed capital reclassified into common stock | $	$ 15,575
Number of votes per share entitled to holders (in votes) | Vote			1
Shares outstanding (in shares)	40,448,744