LONG TERM INCENTIVE PLAN & STOCK OPTIONS - Summary of LTIP (Details) - USD ($)	1 Months Ended			12 Months Ended			96 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Jan. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2012
Additional disclosures
Restricted Shares Granted				850,000	740,000	310,000
Cash proceeds received upon the exercise of options				$ (2,780,188)	$ (2,964,445)	$ (766,926)
Income tax benefits related to stock option activity				968,000	$ 3,228,000	$ 609,000
Excess tax benefits on share based compensation that would be credited directly to contributed capital, if recognized				$ 7,100,000
WEIGHTED AVERAGE EXERCISE PRICE
Exercised (in dollars per share)				$ 4.23	$ 4.17	$ 1.60
AGGREGATE INTRINSIC VALUE
Outstanding (in dollars)				$ 18,648,477	$ 19,730,211	$ 25,956,880	$ 19,730,211	$ 12,559,074
Exercised (in dollars)				$ 2,780,188
Stock options
LONG TERM INCENTIVE PLAN & STOCK OPTIONS
Options granted (in shares)				1,697,500	1,731,500	920,500
Expiration term				10 years
Vesting period				3 years
Additional disclosures
Minimum period for which previously issued shares are to be held by the recipient for non-cash exchange to newly issued shares				6 months
Cash proceeds received upon the exercise of options				$ 2,780,188	$ 2,964,445	$ 766,926
SHARES
Outstanding at the beginning of the period (in shares)			6,228,000	6,885,083	6,228,000	5,989,200
Granted (in shares)				1,697,500	1,731,500	920,500
Exercised (in shares)				(794,248)	(1,029,016)	(623,700)
Forfeited (in shares)				(29,333)	(45,401)	(58,000)
Outstanding at the end of the period (in shares)				7,759,002	6,885,083	6,228,000	6,885,083
WEIGHTED AVERAGE EXERCISE PRICE
Outstanding at the beginning of the period (in dollars per share)			$ 6.27	$ 7.41	$ 6.27	$ 5.95
Granted (in dollars per share)				8.30	9.43	5.74
Exercised (in dollars per share)				3.50	2.88	1.23
Forfeited (in dollars per share)				6.91	6.19	8.31
Outstanding at the end of the period (in dollars per share)				$ 7.84	$ 7.41	$ 6.27	$ 7.41
AGGREGATE INTRINSIC VALUE
Exercised (in dollars)					$ 2,964,445	$ 1,920,557
LTIP
LONG TERM INCENTIVE PLAN & STOCK OPTIONS
Number of common shares reserved for issuance				11,500,000
LTIP | Stock options
LONG TERM INCENTIVE PLAN & STOCK OPTIONS
Expiration term				10 years
Vesting period				3 years
Additional disclosures
Expense related to All Restricted Shares				$ 5,193,481	$ 4,597,412	$ 3,877,695
LTIP | Restricted common shares
Additional disclosures
Restricted Shares Granted				850,000	740,000	310,000
Average Market Value Per Share on Grant Date				$ 8.23	$ 9.42	$ 3.94
Expense related to All Restricted Shares				$ 3,694,496	$ 5,497,274	$ 1,961,501
Unearned Stock Based Compensation for All Restricted Stock Awards Attributable to Future Periods				$ 5,911,019
LTIP | Restricted common shares | 2014 grant
LONG TERM INCENTIVE PLAN & STOCK OPTIONS
Vesting period		7 months	14 months
Additional disclosures
Restricted Shares Granted		420,000	320,000
LTIP | Restricted common shares | 2015 grant
LONG TERM INCENTIVE PLAN & STOCK OPTIONS
Vesting period	20 months
Additional disclosures
Restricted Shares Granted	850,000
Old Plan
LONG TERM INCENTIVE PLAN & STOCK OPTIONS
Options granted (in shares)							0
SHARES
Granted (in shares)							0