SHAREHOLDER'S EQUITY (Details) - USD ($) |
1 Months Ended | 3 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 28, 2018 |
Dec. 14, 2018 |
Sep. 14, 2018 |
Jun. 28, 2018 |
Dec. 15, 2017 |
Nov. 17, 2017 |
Sep. 15, 2017 |
Aug. 30, 2017 |
Jun. 15, 2017 |
Mar. 15, 2017 |
Dec. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2017 |
Oct. 16, 2017 |
Sep. 30, 2017 |
Jul. 16, 2017 |
Jun. 30, 2017 |
Apr. 16, 2017 |
Mar. 31, 2017 |
Jan. 16, 2017 |
Oct. 16, 2016 |
Jul. 16, 2016 |
Apr. 16, 2016 |
Jan. 16, 2016 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Conversion Of Class B Common Stock [Abstract] | |||||||||||||||||||||||||||||
| Conversion of Class B common stock to Class A common stock (Share) | 3,152,333 | ||||||||||||||||||||||||||||
| Dividends And Shares Activitiy [Line Items] | |||||||||||||||||||||||||||||
| Dvidend Equivalent liability - short term | $ 1,279,000 | $ 830,000 | $ 1,279,000 | $ 830,000 | |||||||||||||||||||||||||
| Dvidend Equivalent liability - long term | 1,041,000 | 1,331,000 | 1,041,000 | 1,331,000 | |||||||||||||||||||||||||
| Total Dividend Equivalent Liability | $ 2,320,000 | 2,161,000 | $ 2,320,000 | 2,161,000 | |||||||||||||||||||||||||
| CommonStockDividendsPerShareDeclared | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.075 | $ 0.2 | $ 0.075 | $ 0.075 | $ 0.36 | $ 0.3 | ||||||||||||||||||
| Dividend payments | $ 12,440,990 | $ 12,366,985 | $ 12,486,825 | $ 12,475,445 | $ 12,633,039 | $ 2,921,727 | $ 7,791,075 | $ 2,920,860 | $ 2,915,952 | $ 49,770,000 | $ 29,296,000 | $ 8,666,000 | |||||||||||||||||
| Shares of stock deemed repurchased | 506,000 | 169,000 | 232,000 | ||||||||||||||||||||||||||
| Amount recorded as financing activity | $ (5,186,000) | $ (2,565,000) | $ (2,268,000) | ||||||||||||||||||||||||||
| The total cost to repurchase | (29,407,000) | (10,675,000) | 0 | ||||||||||||||||||||||||||
| Dividends paid on preferred stock | $ 236,806 | $ 687,500 | $ 550,000 | $ 550,000 | $ 550,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | 2,574,000 | 1,788,000 | |||||||||||||||||
| Employee stock purchase plan, authorized shares | 1,000,000 | 1,000,000 | |||||||||||||||||||||||||||
| Stock Issued During Period Value Employee Stock Purchase Plan | $ 1,428,000 | 182,000 | 379,000 | ||||||||||||||||||||||||||
| Total Non cash compensation expense recognized | $ 11,989,000 | 6,239,000 | 4,218,000 | ||||||||||||||||||||||||||
| Espp Shares Market Value | 85.00% | 85.00% | |||||||||||||||||||||||||||
| Espp Share Discount | 15.00% | 15.00% | |||||||||||||||||||||||||||
| PreferredStockDividendsPerShareDeclared | $ 21,527.78 | $ 62,500 | $ 50,000 | $ 50,000 | $ 50,000 | $ 0 | $ 0 | $ 0 | $ 0 | ||||||||||||||||||||
| PaymentsOfDividendsAbstract | |||||||||||||||||||||||||||||
| Payments of Dividends, Common Stock | $ 12,440,990 | $ 12,366,985 | $ 12,486,825 | $ 12,475,445 | $ 12,633,039 | $ 2,921,727 | $ 7,791,075 | $ 2,920,860 | $ 2,915,952 | $ 49,770,000 | 29,296,000 | 8,666,000 | |||||||||||||||||
| PaymentsOfDividendsPreferredStockAndPreferenceStock | $ 0 | $ 0 | $ 0 | $ 0 | $ 924,000 | $ 550,000 | $ 550,000 | $ 550,000 | 0 | $ 2,574,000 | $ 1,788,000 | ||||||||||||||||||
| Treasury Stock Line Items | |||||||||||||||||||||||||||||
| Stock Repurchase Prgram Authorized Amount | $ 100,000,000 | $ 100,000,000 | |||||||||||||||||||||||||||
| Average Cost per share of Acquired Treasury Shares | $ 9.11 | ||||||||||||||||||||||||||||
| ESPP [Member] | |||||||||||||||||||||||||||||
| Dividends And Shares Activitiy [Line Items] | |||||||||||||||||||||||||||||
| Stock Issued During Period Shares Employee Stock Purchase Plans | 228,000 | 15,000 | 32,000 | ||||||||||||||||||||||||||
| Total Non cash compensation expense recognized | $ 252,000 | $ 32,000 | $ 67,000 | ||||||||||||||||||||||||||