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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) Statement - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Deficit | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Common Stock, Shares, Outstanding |  | 40,212,000 |  |  |
Stockholders' Equity Attributable to Parent | $ 223,146 | $ 40 | $ 426,750 | $ (196,316) | $ (7,328)
Balance (in shares) at Dec. 31, 2017 |  | 40,212,000 |  |  |
Balance at Dec. 31, 2017 | 223,146 | $ 40 | 426,750 | (196,316) | (7,328)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income | 31,339 | 0 | 0 | 31,339 | 0
Foreign currency translation | 976 | 0 | 0 | 0 | 976
Interest rate swaps, net of the change in taxes | 824 | $ 0 | 0 | 0 | 824
Repurchases of common stock, net of retirements (shares) |  | (18,000) |  |  |
Repurchases of common stock, net of retirements | (2,592) | $ 0 | 0 | (2,592) | 0
Share-based compensation | 3,321 | $ 0 | 3,321 | 0 | 0
Issuance of shares under share-based compensation plans (shares) |  | 375,000 |  |  |
Issuance of shares under share-based compensation plans | 7,808 | $ 1 | 7,807 | 0 | 0
Declaration of cash dividends | (15,011) | 0 | 0 | (15,011) | 0
Other | (26) | 0 | 0 | 0 | (26)
Balance at Mar. 31, 2018 | 249,785 | $ 41 | 437,878 | (182,580) | (5,554)
Balance (in shares) at Mar. 31, 2018 |  | 40,569,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income | 31,339 | $ 0 | 0 | 31,339 | 0
Foreign currency translation | 976 | 0 | 0 | 0 | 976
Change in unrealized (losses) gains on interest rate swaps, net of change in taxes of $188, $(177), $692 and $(636) | 824 | $ 0 | 0 | 0 | 824
Stock Repurchased and Retired During Period, Shares |  | 18,000 |  |  |
Stock Repurchased and Retired During Period, Value | 2,592 | $ 0 | 0 | 2,592 | 0
Share-based compensation | 3,321 | $ 0 | 3,321 | 0 | 0
Issuance of shares under share-based compensation plans (shares) |  | 375,000 |  |  |
Issuance of shares under share-based compensation plans | 7,808 | $ 1 | 7,807 | 0 | 0
Dividends, Common Stock, Cash | 15,011 | $ 0 | 0 | 15,011 | 0
Common Stock, Shares, Outstanding |  | 40,212,000 |  |  |
Stockholders' Equity Attributable to Parent | 223,146 | $ 40 | 426,750 | (196,316) | (7,328)
Other | (26) | $ 0 | 0 | 0 | (26)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax | (275) |  |  |  |
Balance (in shares) at Dec. 31, 2017 |  | 40,212,000 |  |  |
Balance at Dec. 31, 2017 | 223,146 | $ 40 | 426,750 | (196,316) | (7,328)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income | 217,649 |  |  |  |
Foreign currency translation | (2,188) |  |  |  |
Interest rate swaps, net of the change in taxes | 1,908 |  |  |  |
Balance at Sep. 30, 2018 | $ 372,738 | $ 40 | 449,276 | (68,943) | (7,635)
Balance (in shares) at Sep. 30, 2018 | 40,479,584 | 40,480,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income | $ 217,649 |  |  |  |
Foreign currency translation | (2,188) |  |  |  |
Change in unrealized (losses) gains on interest rate swaps, net of change in taxes of $188, $(177), $692 and $(636) | $ 1,908 |  |  |  |
Common Stock, Shares, Outstanding | 40,479,584 | 40,212,000 |  |  |
Stockholders' Equity Attributable to Parent | $ 223,146 | $ 40 | 426,750 | (196,316) | (7,328)
Common Stock, Shares, Outstanding |  | 40,569,000 |  |  |
Stockholders' Equity Attributable to Parent | 249,785 | $ 41 | 437,878 | (182,580) | (5,554)
Balance (in shares) at Mar. 31, 2018 |  | 40,569,000 |  |  |
Balance at Mar. 31, 2018 | 249,785 | $ 41 | 437,878 | (182,580) | (5,554)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income | 117,049 | 0 | 0 | 117,049 | 0
Foreign currency translation | (3,854) | 0 | 0 | 0 | (3,854)
Interest rate swaps, net of the change in taxes | 554 | $ 0 | 0 | 0 | 554
Repurchases of common stock, net of retirements (shares) |  | (259,000) |  |  |
Repurchases of common stock, net of retirements | (36,284) | $ (1) | 0 | (36,283) | 0
Share-based compensation | 3,160 | $ 0 | 3,160 | 0 | 0
Issuance of shares under share-based compensation plans (shares) |  | 61,000 |  |  |
Issuance of shares under share-based compensation plans | 1,575 | $ 0 | 1,575 | 0 | 0
Declaration of cash dividends | (18,183) | 0 | 0 | (18,183) | 0
Other | (1) | 0 | 1 | (1) | (1)
Balance at Jun. 30, 2018 | 313,801 | $ 40 | 442,614 | (119,998) | (8,855)
Balance (in shares) at Jun. 30, 2018 |  | 40,371,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income | 117,049 | $ 0 | 0 | 117,049 | 0
Foreign currency translation | (3,854) | 0 | 0 | 0 | (3,854)
Change in unrealized (losses) gains on interest rate swaps, net of change in taxes of $188, $(177), $692 and $(636) | 554 | $ 0 | 0 | 0 | 554
Stock Repurchased and Retired During Period, Shares |  | 259,000 |  |  |
Stock Repurchased and Retired During Period, Value | 36,284 | $ 1 | 0 | 36,283 | 0
Share-based compensation | 3,160 | $ 0 | 3,160 | 0 | 0
Issuance of shares under share-based compensation plans (shares) |  | 61,000 |  |  |
Issuance of shares under share-based compensation plans | 1,575 | $ 0 | 1,575 | 0 | 0
Dividends, Common Stock, Cash | 18,183 | $ 0 | 0 | 18,183 | 0
Common Stock, Shares, Outstanding |  | 40,569,000 |  |  |
Stockholders' Equity Attributable to Parent | 249,785 | $ 41 | 437,878 | (182,580) | (5,554)
Other | (1) | $ 0 | 1 | (1) | (1)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax | (185) |  |  |  |
Common Stock, Shares, Outstanding |  | 40,371,000 |  |  |
Stockholders' Equity Attributable to Parent | 313,801 | $ 40 | 442,614 | (119,998) | (8,855)
Net Income | 69,261 | 0 | 0 |  | 0
Foreign currency translation | 690 | 0 | 0 | 0 | 690
Interest rate swaps, net of the change in taxes | 530 | $ 0 | 0 | 0 | 530
Repurchases of common stock, net of retirements (shares) |  | 0 |  |  |
Repurchases of common stock, net of retirements | (30) | $ 0 | 0 | (30) | 0
Share-based compensation | 3,312 | $ 0 | 3,312 | 0 | 0
Issuance of shares under share-based compensation plans (shares) |  | 109,000 |  |  |
Issuance of shares under share-based compensation plans | 3,349 | $ 0 | 3,349 | 0 | 0
Declaration of cash dividends | (18,177) | 0 | 0 | (18,177) | 0
Other | 2 | 0 | 1 | 1 | 0
Balance at Sep. 30, 2018 | $ 372,738 | $ 40 | 449,276 | (68,943) | (7,635)
Balance (in shares) at Sep. 30, 2018 | 40,479,584 | 40,480,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income | $ 69,261 | $ 0 | 0 |  | 0
Foreign currency translation | 690 | 0 | 0 | 0 | 690
Change in unrealized (losses) gains on interest rate swaps, net of change in taxes of $188, $(177), $692 and $(636) | 530 | $ 0 | 0 | 0 | 530
Stock Repurchased and Retired During Period, Shares |  | 0 |  |  |
Stock Repurchased and Retired During Period, Value | 30 | $ 0 | 0 | 30 | 0
Share-based compensation | 3,312 | $ 0 | 3,312 | 0 | 0
Issuance of shares under share-based compensation plans (shares) |  | 109,000 |  |  |
Issuance of shares under share-based compensation plans | 3,349 | $ 0 | 3,349 | 0 | 0
Dividends, Common Stock, Cash | $ 18,177 | $ 0 | 0 | 18,177 | 0
Common Stock, Shares, Outstanding | 40,479,584 | 40,371,000 |  |  |
Stockholders' Equity Attributable to Parent | $ 313,801 | $ 40 | 442,614 | (119,998) | (8,855)
Other | 2 | $ 0 | 1 | 1 | 0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax | $ (177) |  |  |  |
Common Stock, Shares, Outstanding | 40,479,584 | 40,480,000 |  |  |
Stockholders' Equity Attributable to Parent | $ 372,738 | $ 40 | 449,276 | (68,943) | (7,635)
Common Stock, Shares, Outstanding | 39,506,067 | 39,506,000 |  |  |
Stockholders' Equity Attributable to Parent | $ 223,590 | $ 40 | 453,193 | (218,646) | (10,997)
Balance (in shares) at Dec. 31, 2018 | 39,506,067 | 39,506,000 |  |  |
Balance at Dec. 31, 2018 | $ 223,590 | $ 40 | 453,193 | (218,646) | (10,997)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income | 32,637 | 0 | 0 | 32,637 | 0
Foreign currency translation | 214 | 0 | 0 | 0 | 214
Interest rate swaps, net of the change in taxes | (269) | $ 0 | 0 | 0 | (269)
Repurchases of common stock, net of retirements (shares) |  | (155,000) |  |  |
Repurchases of common stock, net of retirements | (23,097) | $ (1) | 0 | (23,096) | 0
Share-based compensation | 3,259 | $ 0 | 3,259 | 0 | 0
Issuance of shares under share-based compensation plans (shares) |  | 328,000 |  |  |
Issuance of shares under share-based compensation plans | 7,071 | $ 1 | 7,070 | 0 | 0
Declaration of cash dividends | (17,819) | 0 | 0 | (17,819) | 0
Balance at Mar. 31, 2019 | 224,877 | $ 40 | 463,522 | (227,633) | (11,052)
Balance (in shares) at Mar. 31, 2019 |  | 39,679,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income | 32,637 | $ 0 | 0 | 32,637 | 0
Foreign currency translation | 214 | 0 | 0 | 0 | 214
Change in unrealized (losses) gains on interest rate swaps, net of change in taxes of $188, $(177), $692 and $(636) | (269) | $ 0 | 0 | 0 | (269)
Stock Repurchased and Retired During Period, Shares |  | 155,000 |  |  |
Stock Repurchased and Retired During Period, Value | 23,097 | $ 1 | 0 | 23,096 | 0
Share-based compensation | 3,259 | $ 0 | 3,259 | 0 | 0
Issuance of shares under share-based compensation plans (shares) |  | 328,000 |  |  |
Issuance of shares under share-based compensation plans | 7,071 | $ 1 | 7,070 | 0 | 0
Dividends, Common Stock, Cash | $ 17,819 | $ 0 | 0 | 17,819 | 0
Common Stock, Shares, Outstanding | 39,506,067 | 39,506,000 |  |  |
Stockholders' Equity Attributable to Parent | $ 223,590 | $ 40 | 453,193 | (218,646) | (10,997)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax | $ 90 |  |  |  |
Balance (in shares) at Dec. 31, 2018 | 39,506,067 | 39,506,000 |  |  |
Balance at Dec. 31, 2018 | $ 223,590 | $ 40 | 453,193 | (218,646) | (10,997)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income | 243,551 |  |  |  |
Foreign currency translation | (734) |  |  |  |
Interest rate swaps, net of the change in taxes | (2,074) |  |  |  |
Balance at Sep. 30, 2019 | $ 405,970 | $ 40 | 480,478 | (60,743) | (13,805)
Balance (in shares) at Sep. 30, 2019 | 40,020,216 | 40,020,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income | $ 243,551 |  |  |  |
Foreign currency translation | (734) |  |  |  |
Change in unrealized (losses) gains on interest rate swaps, net of change in taxes of $188, $(177), $692 and $(636) | $ (2,074) |  |  |  |
Common Stock, Shares, Outstanding | 40,020,216 | 39,506,000 |  |  |
Stockholders' Equity Attributable to Parent | $ 223,590 | $ 40 | 453,193 | (218,646) | (10,997)
Common Stock, Shares, Outstanding |  | 39,679,000 |  |  |
Stockholders' Equity Attributable to Parent | 224,877 | $ 40 | 463,522 | (227,633) | (11,052)
Balance (in shares) at Mar. 31, 2019 |  | 39,679,000 |  |  |
Balance at Mar. 31, 2019 | 224,877 | $ 40 | 463,522 | (227,633) | (11,052)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income | 131,390 | 0 | 0 | 131,390 | 0
Foreign currency translation | 1,208 | 0 | 0 | 0 | 1,208
Interest rate swaps, net of the change in taxes | (1,240) | 0 | 0 | 0 | (1,240)
Share-based compensation | 3,335 | $ 0 | 3,335 | 0 | 0
Issuance of shares under share-based compensation plans (shares) |  | 219,000 |  |  |
Issuance of shares under share-based compensation plans | 5,533 | $ 0 | 5,533 | 0 | 0
Declaration of cash dividends | (21,934) | 0 | 0 | (21,934) | 0
Balance at Jun. 30, 2019 | 343,169 | $ 40 | 472,390 | (118,177) | (11,084)
Balance (in shares) at Jun. 30, 2019 |  | 39,898,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income | 131,390 | $ 0 | 0 | 131,390 | 0
Foreign currency translation | 1,208 | 0 | 0 | 0 | 1,208
Change in unrealized (losses) gains on interest rate swaps, net of change in taxes of $188, $(177), $692 and $(636) | (1,240) | 0 | 0 | 0 | (1,240)
Share-based compensation | 3,335 | $ 0 | 3,335 | 0 | 0
Issuance of shares under share-based compensation plans (shares) |  | 219,000 |  |  |
Issuance of shares under share-based compensation plans | 5,533 | $ 0 | 5,533 | 0 | 0
Dividends, Common Stock, Cash | 21,934 | $ 0 | 0 | 21,934 | 0
Common Stock, Shares, Outstanding |  | 39,679,000 |  |  |
Stockholders' Equity Attributable to Parent | 224,877 | $ 40 | 463,522 | (227,633) | (11,052)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax | 413 |  |  |  |
Common Stock, Shares, Outstanding |  | 39,898,000 |  |  |
Stockholders' Equity Attributable to Parent | 343,169 | $ 40 | 472,390 | (118,177) | (11,084)
Net Income | 79,525 | 0 | 0 | 79,525 | 0
Foreign currency translation | (2,156) | 0 | 0 | 0 | (2,156)
Interest rate swaps, net of the change in taxes | (565) | $ 0 | 0 | 0 | (565)
Repurchases of common stock, net of retirements (shares) |  | (1,000) |  |  |
Repurchases of common stock, net of retirements | (92) | $ 0 | 0 | (92) | 0
Share-based compensation | 3,649 | $ 0 | 3,649 | 0 | 0
Issuance of shares under share-based compensation plans (shares) |  | 123,000 |  |  |
Issuance of shares under share-based compensation plans | 4,439 | $ 0 | 4,439 | 0 | 0
Declaration of cash dividends | (21,999) | 0 | 0 | (21,999) | 0
Balance at Sep. 30, 2019 | $ 405,970 | $ 40 | 480,478 | (60,743) | (13,805)
Balance (in shares) at Sep. 30, 2019 | 40,020,216 | 40,020,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net Income | $ 79,525 | $ 0 | 0 | 79,525 | 0
Foreign currency translation | (2,156) | 0 | 0 | 0 | (2,156)
Change in unrealized (losses) gains on interest rate swaps, net of change in taxes of $188, $(177), $692 and $(636) | (565) | $ 0 | 0 | 0 | (565)
Stock Repurchased and Retired During Period, Shares |  | 1,000 |  |  |
Stock Repurchased and Retired During Period, Value | 92 | $ 0 | 0 | 92 | 0
Share-based compensation | 3,649 | $ 0 | 3,649 | 0 | 0
Issuance of shares under share-based compensation plans (shares) |  | 123,000 |  |  |
Issuance of shares under share-based compensation plans | 4,439 | $ 0 | 4,439 | 0 | 0
Dividends, Common Stock, Cash | $ 21,999 | $ 0 | 0 | 21,999 | 0
Common Stock, Shares, Outstanding | 40,020,216 | 39,898,000 |  |  |
Stockholders' Equity Attributable to Parent | $ 343,169 | $ 40 | 472,390 | (118,177) | (11,084)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax | $ 188 |  |  |  |
Common Stock, Shares, Outstanding | 40,020,216 | 40,020,000 |  |  |
Stockholders' Equity Attributable to Parent | $ 405,970 | $ 40 | $ 480,478 | $ (60,743) | $ (13,805)

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