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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Treasury Shares [Member] | Common Stock [Member] | Preferred Shares Issued [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ 439,988 | $ (105,123) |  | $ 458 |  | $ 86,186 | $ 464,748 | $ (6,281)
Beginning balance (in shares) at Dec. 31, 2017 |  | (11,043) |  | (45,778) | (10) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Vesting of performance share units | (1,273) | $ (1,273) |  | $ 1 |  | (1) |  |
Vesting of performance share units (in shares) |  | 43 | [1] | 127 |  |  |  |
Vesting of restricted stock units | 0 |  |  |  |  |  |  |
Grants and vesting of restricted stock, shares (in shares) |  |  |  | (50) |  |  |  |
Stock option exercises | (3,520) | $ (18,723) |  | $ 8 |  | 15,195 |  |
Stock option exercises (in shares) |  | (568) | [1] | (804) |  |  |  |
Retirement of treasury shares | 0 | $ 19,996 |  | $ (6) |  | (19,990) |  |
Retirement of treasury shares, shares (in shares) |  | (611) |  | (611) |  |  |  |
Purchases of treasury stock | (2,746) | $ (2,746) |  |  |  |  |  |
Purchases of treasury stock (in shares) |  | (93) |  |  |  |  |  |
Share-based compensation | 2,904 |  |  |  |  | 2,904 |  |
Net income | 40,055 |  |  |  |  |  | 40,055 |
Other comprehensive income (loss) | (4,050) |  |  |  |  |  |  | (4,050)
Reclassification of income taxes upon adoption of ASU 2018-02 |  |  |  |  |  |  | 582 | (582)
Declaration of dividends | (4,906) |  |  |  |  |  | (4,906) |
Ending balance at Mar. 31, 2018 | 466,452 | $ (107,869) |  | $ 461 |  | 84,294 | 496,878 | (7,312)
Ending balance (in shares) at Mar. 31, 2018 |  | (11,136) |  | (46,148) | (10) |  |  |
Beginning balance at Dec. 31, 2017 | 439,988 | $ (105,123) |  | $ 458 |  | 86,186 | 464,748 | (6,281)
Beginning balance (in shares) at Dec. 31, 2017 |  | (11,043) |  | (45,778) | (10) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 123,519 |  |  |  |  |  |  |
Other comprehensive income (loss) | (6,636) |  |  |  |  |  |  |
Ending balance at Sep. 30, 2018 | 532,382 | $ (116,239) |  | $ 463 |  | 88,231 | 569,825 | (9,898)
Ending balance (in shares) at Sep. 30, 2018 |  | (11,385) |  | (46,318) | (10) |  |  |
Beginning balance at Mar. 31, 2018 | 466,452 | $ (107,869) |  | $ 461 |  | 84,294 | 496,878 | (7,312)
Beginning balance (in shares) at Mar. 31, 2018 |  | (11,136) |  | (46,148) | (10) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Stock option exercises | (1,716) | $ (8,015) |  | $ 4 |  | 6,295 |  |
Stock option exercises (in shares) |  | (244) | [1] | (353) |  |  |  |
Retirement of treasury shares | 0 | $ 8,015 |  | $ (2) |  | (8,013) |  |
Retirement of treasury shares, shares (in shares) |  | (244) |  | (244) |  |  |  |
Purchases of treasury stock | (8,370) | $ (8,370) |  |  |  |  |  |
Purchases of treasury stock (in shares) |  | (249) |  |  |  |  |  |
Share-based compensation | 3,349 |  |  |  |  | 3,349 |  |
Net income | 46,084 |  |  |  |  |  | 46,084 |
Other comprehensive income (loss) | (1,849) |  |  |  |  |  |  | (1,849)
Declaration of dividends | (4,923) |  |  |  |  |  | (4,923) |
Declaration of third quarter dividends | (5,596) |  |  |  |  |  | (5,596) |
Ending balance at Jun. 30, 2018 | 493,431 | $ (116,239) |  | $ 463 |  | 85,925 | 532,443 | (9,161)
Ending balance (in shares) at Jun. 30, 2018 |  | (11,385) |  | (46,257) | (10) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Stock option exercises | (939) | $ (4,744) |  | $ 1 |  | 3,804 |  |
Stock option exercises (in shares) |  | (108) |  | (169) |  |  |  |
Retirement of treasury shares | 0 | $ 4,744 |  | $ (1) |  | (4,743) |  |
Retirement of treasury shares, shares (in shares) |  | (108) |  | (108) |  |  |  |
Share-based compensation | 3,245 |  |  |  |  | 3,245 |  |
Net income | 37,380 |  |  |  |  |  | 37,380 |
Other comprehensive income (loss) | (737) |  |  |  |  |  |  | (737)
Declaration of dividends | (3) |  |  |  |  |  |  |
Other | (5) |  |  |  |  |  |  |
Ending balance at Sep. 30, 2018 | 532,382 | $ (116,239) |  | $ 463 |  | 88,231 | 569,825 | (9,898)
Ending balance (in shares) at Sep. 30, 2018 |  | (11,385) |  | (46,318) | (10) |  |  |
Beginning balance at Dec. 31, 2018 | 501,633 | $ (130,399) |  | $ 465 |  | 86,353 | 553,224 | (8,010)
Beginning balance (in shares) at Dec. 31, 2018 |  | (11,731) |  | (46,514) | (10) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Vesting of performance share units | (2,069) | $ (2,069) |  | $ 2 |  | (2) |  |
Vesting of performance share units (in shares) |  | 56 | [1] | 148 |  |  |  |
Vesting of restricted stock units | (166) | $ (166) |  |  |  |  |  |
Grants and vesting of restricted stock, shares (in shares) |  | (5) | [1] | (25) |  |  |  |
Stock option exercises | 72 | $ (1,367) |  | $ 1 |  | 1,438 |  |
Stock option exercises (in shares) |  | (36) | [1] | (84) |  |  |  |
Retirement of treasury shares | 0 | $ 3,602 |  | $ (1) |  | (3,601) |  |
Retirement of treasury shares, shares (in shares) |  | (97) |  | (97) |  |  |  |
Purchases of treasury stock | (10,117) | $ (10,117) |  |  |  |  |  |
Purchases of treasury stock (in shares) |  | (321) |  |  |  |  |  |
Share-based compensation | 3,140 |  |  |  |  | 3,140 |  |
Net income | 40,148 |  |  |  |  |  | 40,148 |
Other comprehensive income (loss) | 11,984 |  |  |  |  |  |  | 11,984
Declaration of dividends | (5,575) |  |  |  |  |  | (5,575) |
Ending balance at Mar. 31, 2019 | 539,050 | $ (140,516) |  | $ 467 |  | 87,328 | 587,797 | 3,974
Ending balance (in shares) at Mar. 31, 2019 |  | (12,052) |  | (46,674) | (10) |  |  |
Beginning balance at Dec. 31, 2018 | 501,633 | $ (130,399) |  | $ 465 |  | 86,353 | 553,224 | (8,010)
Beginning balance (in shares) at Dec. 31, 2018 |  | (11,731) |  | (46,514) | (10) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 97,587 |  |  |  |  |  |  |
Other comprehensive income (loss) | 29,099 |  |  |  |  |  |  |
Ending balance at Sep. 30, 2019 | 568,981 | $ (180,331) |  | $ 467 |  | 93,546 | 634,210 | 21,089
Ending balance (in shares) at Sep. 30, 2019 |  | (13,502) |  | (46,713) | (10) |  |  |
Beginning balance at Mar. 31, 2019 | 539,050 | $ (140,516) |  | $ 467 |  | 87,328 | 587,797 | 3,974
Beginning balance (in shares) at Mar. 31, 2019 |  | (12,052) |  | (46,674) | (10) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Vesting of restricted stock units | (402) | $ (402) |  |  |  |  |  |
Grants and vesting of restricted stock, shares (in shares) |  | (14) | [1] | (25) |  |  |  |
Stock option exercises | (11) | $ (414) |  | $ 0 |  | 403 |  |
Stock option exercises (in shares) |  | (14) | [1] | (27) |  |  |  |
Retirement of treasury shares | 0 | $ 816 |  | $ 0 |  | (816) |  |
Retirement of treasury shares, shares (in shares) |  | (28) |  | (28) |  |  |  |
Purchases of treasury stock | (14,107) | $ (14,107) |  |  |  |  |  |
Purchases of treasury stock (in shares) |  | (486) |  |  |  |  |  |
Share-based compensation | 3,311 |  |  |  |  | 3,311 |  |
Net income | 37,293 |  |  |  |  |  | 37,293 |
Other comprehensive income (loss) | 11,955 |  |  |  |  |  |  | 11,955
Declaration of dividends | (5,547) |  |  |  |  |  | (5,547) |
Declaration of third quarter dividends | (5,476) |  |  |  |  |  | (5,476) |
Ending balance at Jun. 30, 2019 | 566,066 | $ (154,623) |  | $ 467 |  | 90,226 | 614,067 | 15,929
Ending balance (in shares) at Jun. 30, 2019 |  | (12,538) |  | (46,698) | (10) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Vesting of restricted stock units | (259) | $ (259) |  |  |  |  |  |
Grants and vesting of restricted stock, shares (in shares) |  | (10) | [1] | (25) |  |  |  |
Stock option exercises | (5) | $ (59) |  | $ 0 |  | 54 |  |
Stock option exercises (in shares) |  | (2) | [1] | (2) |  |  |  |
Retirement of treasury shares | 0 | $ 318 |  | $ 0 |  | (318) |  |
Retirement of treasury shares, shares (in shares) |  | (12) |  | (12) |  |  |  |
Purchases of treasury stock | (25,708) | $ (25,708) |  |  |  |  |  |
Purchases of treasury stock (in shares) |  | (964) |  |  |  |  |  |
Share-based compensation | 3,584 |  |  |  |  | 3,584 |  |
Net income | 20,146 |  |  |  |  |  | 20,146 |
Other comprehensive income (loss) | 5,160 |  |  |  |  |  |  | 5,160
Declaration of dividends | (3) |  |  |  |  |  | (3) |
Ending balance at Sep. 30, 2019 | $ 568,981 | $ (180,331) |  | $ 467 |  | $ 93,546 | $ 634,210 | $ 21,089
Ending balance (in shares) at Sep. 30, 2019 |  | (13,502) |  | (46,713) | (10) |  |  |
[1] | All shares acquired represent shares tendered to cover the strike price for options and tax withholdings on the intrinsic value of stock options exercised, restricted stock vested, performance share units vested or restricted stock units vested. These shares have been cancelled by the Company.

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