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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY Statement - USD ($) $ in Thousands | Total | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | $ 67,642 |
Balance, beginning of period (value) at Jun. 30, 2017 |  |  | $ 1,031 | $ 452,016 | 1,585,278 | $ (1,006,274)
Shares, beginning of period at Jun. 30, 2017 |  |  | 103,083,299 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued for equity-based payment arrangements (value) |  |  | $ 1 | 174 |  |
Shares issued for equity-based payment arrangements (shares) |  |  | 110,162 |  |  |
Tax withholding related to share-based compensation |  |  |  | (7,278) |  |
Shares issued for Employee Stock Purchase Plan (value) |  |  | $ 0 | 5,370 |  |
Shares issued for Employee Stock Purchase Plan (shares) |  |  | 55,948 |  |  |
Stock-based compensation expense |  |  |  | 7,834 |  |
Net Income | $ 297,199 |  |  |  | 297,199 |
Dividends (value) |  |  |  |  | (76,429) |
Purchase of treasury shares |  |  |  |  |  | (30,018)
Balance, end of period (value) at Mar. 31, 2018 | $ 1,296,546 |  | $ 1,032 | 458,116 | 1,873,690 | (1,036,292)
Shares, end of period at Mar. 31, 2018 |  |  | 103,249,409 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Dividends declared per share | $ 0.99 |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | 76,769 |
Balance, beginning of period (value) at Dec. 31, 2017 |  |  | $ 1,032 | 452,841 | 1,756,419 | (1,036,292)
Shares, beginning of period at Dec. 31, 2017 |  |  | 103,218,206 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued for equity-based payment arrangements (value) |  |  | $ 0 | 175 |  |
Shares issued for equity-based payment arrangements (shares) |  |  | 11,970 |  |  |
Tax withholding related to share-based compensation |  |  |  | (135) |  |
Shares issued for Employee Stock Purchase Plan (value) |  |  | $ 0 | 2,010 |  |
Shares issued for Employee Stock Purchase Plan (shares) |  |  | 19,233 |  |  |
Stock-based compensation expense |  |  |  | 3,225 |  |
Net Income | $ 69,086 |  |  |  | 69,086 |
Dividends (value) |  |  |  |  | (28,584) |
Purchase of treasury shares |  |  |  |  |  | 0
Balance, end of period (value) at Mar. 31, 2018 | $ 1,296,546 |  | $ 1,032 | 458,116 | 1,873,690 | (1,036,292)
Shares, end of period at Mar. 31, 2018 |  |  | 103,249,409 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Dividends declared per share | $ 0.37 |  |  |  |  |
Preferred Shares |  | 0 |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | 56,016 |
Balance, beginning of period (value) at Jun. 30, 2018 | $ 1,322,844 |  | $ 1,033 | 464,138 | 1,856,917 | (1,055,260)
Shares, beginning of period at Jun. 30, 2018 |  |  | 103,278,562 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued for equity-based payment arrangements (value) |  |  | $ 1 | (1) |  |
Shares issued for equity-based payment arrangements (shares) |  |  | 120,119 |  |  |
Tax withholding related to share-based compensation |  |  |  | (13,797) |  |
Shares issued for Employee Stock Purchase Plan (value) |  |  | $ 1 | 6,658 |  |
Shares issued for Employee Stock Purchase Plan (shares) |  |  | 56,208 |  |  |
Stock-based compensation expense |  |  |  | 8,651 |  |
Net Income | 210,892 |  |  |  | 210,892 |
Dividends (value) |  |  |  |  | (87,970) |
Purchase of treasury shares |  |  |  |  |  | (21,276)
Balance, end of period (value) at Mar. 31, 2019 | $ 1,426,003 |  | $ 1,035 | 465,649 | 2,035,855 | (1,076,536)
Shares, end of period at Mar. 31, 2019 |  |  | 103,454,889 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Dividends declared per share | $ 1.14 |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | 0 |
Balance, beginning of period (value) at Dec. 31, 2018 |  |  | $ 1,034 | 459,988 | 2,007,469 | (1,076,536)
Shares, beginning of period at Dec. 31, 2018 |  |  | 103,428,416 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued for equity-based payment arrangements (value) |  |  | $ 0 | 0 |  |
Shares issued for equity-based payment arrangements (shares) |  |  | 4,722 |  |  |
Tax withholding related to share-based compensation |  |  |  | (313) |  |
Shares issued for Employee Stock Purchase Plan (value) |  |  | $ 1 | 2,469 |  |
Shares issued for Employee Stock Purchase Plan (shares) |  |  | 21,751 |  |  |
Stock-based compensation expense |  |  |  | 3,505 |  |
Net Income | $ 59,252 |  |  |  | 59,252 |
Dividends (value) |  |  |  |  | (30,866) |
Purchase of treasury shares |  |  |  |  |  | 0
Balance, end of period (value) at Mar. 31, 2019 | $ 1,426,003 |  | $ 1,035 | $ 465,649 | $ 2,035,855 | $ (1,076,536)
Shares, end of period at Mar. 31, 2019 |  |  | 103,454,889 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Dividends declared per share | $ 0.40 |  |  |  |  |
Preferred Shares |  | 0 |  |  |  |

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