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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comp. Income (Loss), net
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2016 | $ 1,496,696,000 | $ 46,359,000 | $ 1,083,491,000 | $ 381,073,000 | $ (14,227,000)
Balance (in shares) at Dec. 31, 2016 |  | 46,359,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of employee common stock options and related tax benefits | 2,961,000 | $ 149,000 | 2,812,000 |  |
Exercise of employee common stock options and related tax benefits (in shares) |  | 149,000 |  |  |
Common dividends paid | (7,025,000) |  |  | (7,025,000) |
Issuance of restricted common shares, net of forfeitures | 0 | $ 119,000 | (119,000) |  |
Issuance of restricted common shares, net of forfeitures (in shares) |  | 119,000 |  |  |
Issuance of common equity, net of costs | 192,194,000 | $ 3,220,000 | 188,974,000 |  |
Issuance of common equity, net of costs (in shares) |  | 3,220,000 |  |  |
Restricted shares withheld for taxes and related tax benefit | (3,926,000) | $ (57,000) | (3,869,000) |  |
Restricted shares withheld for taxes (in shares) |  | (57,000) |  |  |
Compensation expense for restricted shares | 3,474,000 |  | 3,474,000 |  |
Net income | 39,653,000 |  |  | 39,653,000 |
Other comprehensive loss | (951,000) |  |  |  | (951,000)
Balance at Mar. 31, 2017 | 1,723,076,000 | $ 49,790,000 | 1,274,763,000 | 413,701,000 | (15,178,000)
Balance (in shares) at Mar. 31, 2017 |  | 49,790,000 |  |  |
Balance at Dec. 31, 2017 | 3,707,952,000 | $ 77,740,000 | 3,115,304,000 | 519,144,000 | (4,236,000)
Balance (in shares) at Dec. 31, 2017 |  | 77,740,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Exercise of employee common stock options and related tax benefits | 1,616,000 | $ 87,000 | 1,529,000 |  |
Exercise of employee common stock options and related tax benefits (in shares) |  | 87,000 |  |  |
Common dividends paid | (10,974,000) |  |  | (10,974,000) |
Issuance of restricted common shares, net of forfeitures | 0 | $ 106,000 | (106,000) |  |
Issuance of restricted common shares, net of forfeitures (in shares) |  | 106,000 |  |  |
Restricted shares withheld for taxes and related tax benefit | (5,265,000) | $ (80,000) | (5,185,000) |  |
Restricted shares withheld for taxes (in shares) |  | (80,000) |  |  |
Compensation expense for restricted shares | 4,448,000 |  | 4,448,000 |  |
Net income | 83,510,000 |  |  | 83,510,000 |
Other comprehensive loss | (31,984,000) |  |  |  | (31,984,000)
Balance at Mar. 31, 2018 | $ 3,749,303,000 | $ 77,853,000 | $ 3,115,990,000 | $ 591,680,000 | $ (36,220,000)
Balance (in shares) at Mar. 31, 2018 |  | 77,853,000 |  |  |

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