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Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Treasury Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2017 |  | 49,321,231 |  |  |  |
Beginning balance at Dec. 31, 2017 | $ 1,514,983 | $ 249,951 | $ (19,906) | $ 898,095 | $ 397,354 | $ (10,511)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 33,826 |  |  |  | 33,826 |
Other comprehensive income (loss) | (6,985) |  |  |  |  | (6,985)
Comprehensive income | 26,841 |  |  |  |  |
Cash dividends | (9,455) |  |  |  | (9,455) |
Issuance of common stock for stock-based compensation awards (in shares) |  | 71,747 |  |  |  |
Issuance of common stock for stock-based compensation awards | (1,482) |  | 1,610 | (3,092) |  |
Stock-based compensation expense | 1,858 |  |  | 1,858 |  |
Other, net | 20 |  |  | 20 |  |
Ending balance (in shares) at Mar. 31, 2018 |  | 49,392,978 |  |  |  |
Ending balance at Mar. 31, 2018 | 1,532,765 | $ 249,951 | (18,296) | 896,881 | 421,725 | (17,496)
Beginning balance (in shares) at Dec. 31, 2017 |  | 49,321,231 |  |  |  |
Beginning balance at Dec. 31, 2017 | 1,514,983 | $ 249,951 | (19,906) | 898,095 | 397,354 | (10,511)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 102,500 |  |  |  |  |
Other comprehensive income (loss) | (13,712) |  |  |  |  |
Comprehensive income | 88,788 |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2018 |  | 58,743,814 |  |  |  |
Ending balance at Sep. 30, 2018 | 2,010,711 | $ 296,484 | (17,225) | 1,287,063 | 468,612 | (24,223)
Beginning balance (in shares) at Mar. 31, 2018 |  | 49,392,978 |  |  |  |
Beginning balance at Mar. 31, 2018 | 1,532,765 | $ 249,951 | (18,296) | 896,881 | 421,725 | (17,496)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 36,710 |  |  |  | 36,710 |
Other comprehensive income (loss) | (2,556) |  |  |  |  | (2,556)
Comprehensive income | 34,154 |  |  |  |  |
Cash dividends | (9,960) |  |  |  | (9,960) |
Issuance of common stock for stock-based compensation awards (in shares) |  | 31,361 |  |  |  |
Issuance of common stock for stock-based compensation awards | (166) |  | 773 | (939) |  |
Stock-based compensation expense | 1,854 |  |  | 1,854 |  |
Other, net | 21 |  |  | 21 |  |
Ending balance (in shares) at Jun. 30, 2018 |  | 49,424,339 |  |  |  |
Ending balance at Jun. 30, 2018 | 1,558,668 | $ 249,951 | (17,523) | 897,817 | 448,475 | (20,052)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 31,964 |  |  |  | 31,964 |
Other comprehensive income (loss) | (4,171) |  |  |  |  | (4,171)
Comprehensive income | 27,793 |  |  |  |  |
Cash dividends | (11,827) |  |  |  | (11,827) |
Common stock issued in connection with an acquisition (in shares) |  | 9,304,477 |  |  |  |
Common stock issued in connection with an acquisition | 434,519 | $ 46,533 |  | 387,986 |  |
Issuance of common stock for stock-based compensation awards (in shares) |  | 14,998 |  |  |  |
Issuance of common stock for stock-based compensation awards | (306) |  | 298 | (604) |  |
Stock-based compensation expense | 1,844 |  |  | 1,844 |  |
Other, net | 20 |  |  | 20 |  |
Ending balance (in shares) at Sep. 30, 2018 |  | 58,743,814 |  |  |  |
Ending balance at Sep. 30, 2018 | 2,010,711 | $ 296,484 | (17,225) | 1,287,063 | 468,612 | (24,223)
Beginning balance (in shares) at Dec. 31, 2018 |  | 58,546,480 |  |  |  |
Beginning balance at Dec. 31, 2018 | 2,043,913 | $ 296,483 | (24,245) | 1,288,911 | 500,660 | (17,896)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 45,110 |  |  |  | 45,110 |
Other comprehensive income (loss) | 10,446 |  |  |  |  | 10,446
Comprehensive income | 55,556 |  |  |  |  |
Cash dividends | (12,442) |  |  |  | (12,442) |
Issuance of common stock for stock-based compensation awards (in shares) |  | 87,150 |  |  |  |
Issuance of common stock for stock-based compensation awards | (787) |  | 2,655 | (3,442) |  |
Stock-based compensation expense | 2,637 |  |  | 2,637 |  |
Ending balance (in shares) at Mar. 31, 2019 |  | 58,633,630 |  |  |  |
Ending balance at Mar. 31, 2019 | 2,088,877 | $ 296,483 | (21,590) | 1,288,106 | 533,328 | (7,450)
Beginning balance (in shares) at Dec. 31, 2018 |  | 58,546,480 |  |  |  |
Beginning balance at Dec. 31, 2018 | 2,043,913 | $ 296,483 | (24,245) | 1,288,911 | 500,660 | (17,896)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 129,181 |  |  |  |  |
Other comprehensive income (loss) | 19,590 |  |  |  |  |
Comprehensive income | 148,771 |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2019 |  | 57,455,306 |  |  |  |
Ending balance at Sep. 30, 2019 | 2,119,659 | $ 296,483 | (62,044) | 1,291,927 | 591,599 | 1,694
Beginning balance (in shares) at Mar. 31, 2019 |  | 58,633,630 |  |  |  |
Beginning balance at Mar. 31, 2019 | 2,088,877 | $ 296,483 | (21,590) | 1,288,106 | 533,328 | (7,450)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 46,625 |  |  |  | 46,625 |
Other comprehensive income (loss) | 7,960 |  |  |  |  | 7,960
Comprehensive income | 54,585 |  |  |  |  |
Cash dividends | (12,971) |  |  |  | (12,971) |
Repurchase of stock in connection with stock repurchase program (in shares) |  | (363,704) |  |  |  |
Repurchase of shares in connection with stock repurchase program | (12,938) |  | (12,938) |  |  |
Issuance of common stock for stock-based compensation awards (in shares) |  | 27,744 |  |  |  |
Issuance of common stock for stock-based compensation awards | 61 |  | 893 | (832) |  |
Stock-based compensation expense | 2,082 |  |  | 2,082 |  |
Ending balance (in shares) at Jun. 30, 2019 |  | 58,297,670 |  |  |  |
Ending balance at Jun. 30, 2019 | 2,119,696 | $ 296,483 | (33,635) | 1,289,356 | 566,982 | 510
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 37,446 |  |  |  | 37,446 |
Other comprehensive income (loss) | 1,184 |  |  |  |  | 1,184
Comprehensive income | 38,630 |  |  |  |  |
Cash dividends | (12,829) |  |  |  | (12,829) |
Repurchase of stock in connection with stock repurchase program (in shares) |  | (851,421) |  |  |  |
Repurchase of shares in connection with stock repurchase program | (28,707) |  | (28,707) |  |  |
Issuance of common stock for stock-based compensation awards (in shares) |  | 9,057 |  |  |  |
Issuance of common stock for stock-based compensation awards | (133) |  | 298 | (431) |  |
Stock-based compensation expense | 3,002 |  |  | 3,002 |  |
Ending balance (in shares) at Sep. 30, 2019 |  | 57,455,306 |  |  |  |
Ending balance at Sep. 30, 2019 | $ 2,119,659 | $ 296,483 | $ (62,044) | $ 1,291,927 | $ 591,599 | $ 1,694

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