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Consolidated Statements of Changes in Stockholders' Equity - USD ($) | Restricted Stock Units (RSUs) [Member] Additional Paid-in Capital [Member] | Restricted Stock Units (RSUs) [Member] Parent [Member] | Series B Preferred Stock [Member] Preferred Stock [Member] | Series B Preferred Stock [Member] Additional Paid-in Capital [Member] | Series B Preferred Stock [Member] Parent [Member] | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Noncontrolling Interest [Member] | Parent [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2012 |  |  |  |  |  | $ 254,580,000 | $ 830,000 | $ 768,925,000 | $ 465,000 | $ 721,993,000 | $ (125,736,000) | $ 8,447,000 | $ 1,629,504,000 |
Balance, shares (in Shares) at Dec. 31, 2012 |  |  |  |  |  | 258,000 | 78,778,288 |  |  |  |  |  |  |
Dividend Reinvestment Plan |  |  |  |  |  |  |  | 605,000 |  |  |  |  | 605,000 | $ 605,000
Dividend Reinvestment Plan, shares (in Shares) |  |  |  |  |  |  | 25,984 |  |  |  |  |  |  | 25,984
Redemption of Series B Preferred Stock |  |  | $ (258,000,000) | $ (302,000) | $ (258,302,000) |  |  |  |  |  |  |  |  |
Redemption of Series B Preferred Stock (in Shares) |  |  | (258,000) |  |  |  |  |  |  |  |  |  |  |
Redemption of noncontrolling interest |  |  |  |  |  |  |  | (191,000) |  |  |  | (8,447,000) | (8,638,000) |
Restricted stock units vested |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  | 1,000 |
Restricted stock units vested, shares (in Shares) |  |  |  |  |  |  | 138,220 |  |  |  |  |  |  |
Stock salary |  |  |  |  |  |  | $ 1,000 | 1,106,000 |  |  |  |  | 1,107,000 |
Stock salary (in Shares) |  |  |  |  |  |  | 52,431 |  |  |  |  |  |  |
Stock options exercised |  |  |  |  |  |  | $ 6,000 | 14,749,000 |  |  |  |  | 14,755,000 |
Stock options exercised, shares (in Shares) |  |  |  |  |  |  | 594,946 |  |  |  |  |  |  | 594,946
Tax short-fall from stock options |  |  |  |  |  |  |  | (2,509,000) |  |  |  |  | (2,509,000) |
Stock -based compensation |  |  |  |  |  |  |  | 2,106,000 |  |  |  |  | 2,106,000 |
Cash dividends |  |  |  |  |  |  |  |  |  | (6,342,000) |  |  | (6,342,000) |
Discount accretion and other adjustment on preferred stock |  |  |  |  |  | $ 3,420,000 |  |  |  | (3,420,000) |  |  |  |
Dividends on preferred stock |  |  |  |  |  |  |  |  |  | (6,265,000) |  | (592,000) | (6,857,000) | $ (9,685,000)
Change in other comprehensive loss |  |  |  |  |  |  |  |  | (30,194,000) |  |  |  | (30,194,000) |
Net income |  |  |  |  |  |  |  |  |  | 123,143,000 |  | $ 592,000 | 123,735,000 | 123,735,000
Balance at Dec. 31, 2013 |  |  |  |  |  |  | $ 838,000 | 784,489,000 | (29,729,000) | 829,109,000 | (125,736,000) |  | 1,458,971,000 |
Balance, shares (in Shares) at Dec. 31, 2013 |  |  |  |  |  |  | 79,589,869 |  |  |  |  |  |  |
Dividend Reinvestment Plan |  |  |  |  |  |  | $ 1,000 | 2,847,000 |  |  |  |  | 2,848,000 | $ 2,800,000
Dividend Reinvestment Plan, shares (in Shares) |  |  |  |  |  |  | 116,957 |  |  |  |  |  |  | 116,957
Restricted stock units vested |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  | 1,000 |
Restricted stock units vested, shares (in Shares) |  |  |  |  |  |  | 88,537 |  |  |  |  |  |  |
Shares withheld related to net share settlement of RSUs | $ (850,000) | $ (850,000) |  |  |  |  |  |  |  |  |  |  |  |
Stock issued to directors |  |  |  |  |  |  |  | 350,000 |  |  |  |  | 350,000 |
Stock issued to directors, shares (in Shares) |  |  |  |  |  |  | 13,690 |  |  |  |  |  |  |
Stock options exercised |  |  |  |  |  |  |  | 128,000 |  |  |  |  | 128,000 |
Stock options exercised, shares (in Shares) |  |  |  |  |  |  | 5,500 |  |  |  |  |  |  | 5,500
Tax short-fall from stock options |  |  |  |  |  |  |  | (1,285,000) |  |  |  |  | (1,285,000) |
Stock -based compensation |  |  |  |  |  |  |  | 3,840,000 |  |  |  |  | 3,840,000 |
Cash dividends |  |  |  |  |  |  |  |  |  | (23,105,000) |  |  | (23,105,000) |
Change in other comprehensive loss |  |  |  |  |  |  |  |  | 24,160,000 |  |  |  | 24,160,000 |
Net income |  |  |  |  |  |  |  |  |  | 137,830,000 |  |  | 137,830,000 | $ 137,830,000
Balance at Dec. 31, 2014 |  |  |  |  |  |  | $ 840,000 | 789,519,000 | (5,569,000) | 943,834,000 | (125,736,000) |  | 1,602,888,000 | 1,602,888,000
Balance, shares (in Shares) at Dec. 31, 2014 |  |  |  |  |  |  | 79,814,553 |  |  |  |  |  |  |
Dividend Reinvestment Plan |  |  |  |  |  |  | $ 2,000 | 4,173,000 |  |  |  |  | 4,175,000 | $ 4,200,000
Dividend Reinvestment Plan, shares (in Shares) |  |  |  |  |  |  | 148,582 |  |  |  |  |  |  | 148,582
Restricted stock units vested, shares (in Shares) |  |  |  |  |  |  | 18,955 |  |  |  |  |  |  |
Warrant exercised (in Shares) |  |  |  |  |  |  | 369 |  |  |  |  |  |  |
Shares withheld related to net share settlement of RSUs | $ (227,000) | $ (227,000) |  |  |  |  |  |  |  |  |  |  |  |
Stock issued to directors |  |  |  |  |  |  |  | 495,000 |  |  |  |  | 495,000 |
Stock issued to directors, shares (in Shares) |  |  |  |  |  |  | 17,974 |  |  |  |  |  |  |
Stock options exercised |  |  |  |  |  |  | $ 2,000 | 5,012,000 |  |  |  |  | 5,014,000 |
Stock options exercised, shares (in Shares) |  |  |  |  |  |  | 214,580 |  |  |  |  |  |  | 214,580
Equity consideration for acquisition |  |  |  |  |  |  | $ 26,000 | 82,743,000 |  |  |  |  | 82,769,000 |
Equity consideration for acquisition (in Shares) |  |  |  |  |  |  | 2,580,353 |  |  |  |  |  |  |
Purchases of treasury stock |  |  |  |  |  |  |  |  |  |  | (59,412,000) |  | (59,412,000) | $ (59,400,000)
Purchases of treasury stock (in Shares) |  |  |  |  |  |  | (1,989,250) |  |  |  |  |  |  |
Tax short-fall from stock options |  |  |  |  |  |  |  | (5,348,000) |  |  |  |  | (5,348,000) |
Stock -based compensation |  |  |  |  |  |  |  | 4,455,000 |  |  |  |  | 4,455,000 |
Cash dividends |  |  |  |  |  |  |  |  |  | (45,283,000) |  |  | (45,283,000) | (45,300,000)
Change in other comprehensive loss |  |  |  |  |  |  |  |  | (2,857,000) |  |  |  | (2,857,000) |
Net income |  |  |  |  |  |  |  |  |  | 161,109,000 |  |  | 161,109,000 | 161,109,000
Balance at Dec. 31, 2015 |  |  |  |  |  |  | $ 870,000 | $ 880,822,000 | $ (8,426,000) | $ 1,059,660,000 | $ (185,148,000) |  | $ 1,747,778,000 | $ 1,747,778,000
Balance, shares (in Shares) at Dec. 31, 2015 |  |  |  |  |  |  | 80,806,116 |  |  |  |  |  |  |

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