Long Term Incentive Plan & Stock Options - Summary of LTIP (Details)	1 Months Ended	12 Months Ended			120 Months Ended
	Oct. 31, 2015 shares	Dec. 31, 2017 USD ($) installment $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2014 USD ($)
Additional disclosures
Restricted shares granted		530,000		850,000
Cash proceeds received upon the exercise of options | $		$ 123,603	$ 80,161	$ 2,780,188
Income tax expense related to stock option activity | $		1,209,000	$ 20,000	$ (943,000)
Excess tax benefits on share based compensation that would be credited directly to contributed capital, if recognized | $		$ 3,000,000
WEIGHTED AVERAGE EXERCISE PRICE
Exercised (in dollars per share) | $ / shares		$ 4.35	$ 3.10	$ 4.23
AGGREGATE INTRINSIC VALUE
Outstanding (in dollars) | $		$ 976,335
Stock options
LONG TERM INCENTIVE PLAN & STOCK OPTIONS
Expiration term		10 years
Number of vesting installments | installment		3
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
LTIP And Old Plan
AGGREGATE INTRINSIC VALUE
Outstanding (in dollars) | $		$ 976,335	$ 1,821,384	$ 18,648,477	$ 1,821,384	$ 19,730,211
Exercised (in dollars) | $		$ 109,847
LTIP And Old Plan | Stock options
LONG TERM INCENTIVE PLAN & STOCK OPTIONS
Options granted (in shares)		15,000	30,000	1,697,500
SHARES
Outstanding at the beginning of the period (in shares)		7,691,501	7,759,002	6,885,083
Granted (in shares)		15,000	30,000	1,697,500
Exercised (in shares)		(433,500)	(25,834)	(794,248)
Forfeited (in shares)		(367,000)	(71,667)	(29,333)
Outstanding at the end of the period (in shares)		6,906,001	7,691,501	7,759,002	7,691,501
WEIGHTED AVERAGE EXERCISE PRICE
Outstanding at the beginning of the period (in dollars per share) | $ / shares		$ 7.83	$ 7.84	$ 7.41
Granted (in dollars per share) | $ / shares		6.09	6.54	8.30
Exercised (in dollars per share) | $ / shares		6.45	4.35	3.50
Forfeited (in dollars per share) | $ / shares		7.85	9.33	6.91
Outstanding at the end of the period (in dollars per share) | $ / shares		$ 7.92	$ 7.83	$ 7.84	$ 7.83
AGGREGATE INTRINSIC VALUE
Exercised (in dollars) | $			$ 112,280	$ 2,780,188
LTIP
LONG TERM INCENTIVE PLAN & STOCK OPTIONS
Number of common shares reserved for issuance		11,500,000
Additional disclosures
Restricted shares granted		530,000	0	850,000
Expense related to All Restricted Shares | $		$ 3,858,503	$ 5,984,524	$ 5,193,481
LTIP | Unvested restricted common shares
Additional disclosures
Restricted shares granted		530,000		850,000
Average Market Value Per Share on Grant Date | $ / shares		$ 5.72		$ 8.23
Expense related to All Restricted Shares | $		$ 3,316,093	$ 4,361,760	$ 3,694,496
Unearned Stock Based Compensation for All Restricted Stock Awards Attributable to Future Periods | $		$ 1,266,666
LTIP | Unvested 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
Outstanding at the end of the period (in shares)		0
Shares granted for consulting services
Additional disclosures
Restricted shares granted		50,000
Shares awarded for performance
Additional disclosures
Restricted shares granted		480,000