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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 |  |  |  |
Grants and vesting of restricted stock | 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 | 86,139 |  |  |  |  |  |  |
Other comprehensive income (loss) | (5,899) |  |  |  |  |  |  |
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) |  |  |
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) |  |  |
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 |  |  |  |
Grants and vesting of restricted stock | (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 | 77,441 |  |  |  |  |  |  |
Other comprehensive income (loss) | 23,939 |  |  |  |  |  |  |
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) |  |  |
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] |  |  |  |  |  |  |  |
Grants and vesting of restricted stock | (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) |  |  |
[1] | All shares acquired represent shares tendered to cover the strike price for options and tax withholdings on the intrinsic value of options exercised or performance share units or restricted stock vested. These shares have been cancelled by the Company.

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- Definition Number of shares of common and preferred stock retired from treasury during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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