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Stockholders' Equity - Schedule of Changes in Stockholders' Equity (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Balance | $ 690,756 | $ 714,551 | $ 662,571 | $ 714,551 | $ 660,417
Net income | 13,656 |  | 14,611 | 24,268 | 29,929
Other comprehensive income (loss) | (164) |  | (2,853) | (11,287) | (2,570)
Equity compensation | 2,518 |  | 3,714 | 6,344 | 7,865
Exercise of stock options |  |  | 25 | 37 | 429
Issuance of shares pursuant to vesting of restricted stock units |  |  |  |  | 1
Net payments for stock issuances and buybacks | 974 |  | (8,789) | (23,024) | (24,158)
Cumulative-effect adjustment for adoption of accounting principle |  |  |  | (513) |
Dividends declared | (2,637) |  | (2,642) | (5,273) | (5,276)
Balance | 705,103 | 690,756 | 666,637 | 705,103 | 666,637
Common Stock |  |  |  |  |
Balance | $ 23 | $ 23 | $ 23 | $ 23 | $ 22
Balance (in shares) | 18,827 | 18,868 | 18,866 | 18,868 | 18,817
Exercise of stock options (in shares) |  |  | 1 | 1 | 12
Issuance of shares pursuant to vesting of restricted stock units |  |  |  |  | $ 1
Issuance of shares pursuant to vesting of restricted stock units (in shares) | 22 |  | 8 | 291 | 263
Net payments for stock issuances and buybacks (in shares) |  |  | (117) | (311) | (334)
Balance | $ 23 | $ 23 | $ 23 | $ 23 | $ 23
Balance (in shares) | 18,849 | 18,827 | 18,758 | 18,849 | 18,758
Additional Paid-in Capital |  |  |  |  |
Balance | $ 350,658 | $ 346,795 | $ 330,763 | $ 346,795 | $ 326,208
Equity compensation | 2,518 |  | 3,714 | 6,344 | 7,865
Exercise of stock options |  |  | 25 | 37 | 429
Net payments for stock issuances and buybacks | 1,024 |  | 843 | 1,024 | 843
Balance | 354,200 | 350,658 | 335,345 | 354,200 | 335,345
Retained Earnings |  |  |  |  |
Balance | 552,303 | 544,840 | 499,126 | 544,840 | 486,442
Net income | 13,656 |  | 14,611 | 24,268 | 29,929
Cumulative-effect adjustment for adoption of accounting principle |  |  |  | (513) |
Dividends declared | (2,637) |  | (2,642) | (5,273) | (5,276)
Balance | 563,322 | 552,303 | 511,095 | 563,322 | 511,095
Treasury Stock |  |  |  |  |
Balance | $ (188,961) | $ (164,963) | $ (155,073) | $ (164,963) | $ (139,704)
Balance (in shares) | 4,289 | 3,978 | 3,846 | 3,978 | 3,629
Net payments for stock issuances and buybacks | $ (50) |  | $ (9,632) | $ (24,048) | $ (25,001)
Net payments for stock issuances and buybacks (in shares) |  |  | 129 | 311 | 346
Balance | $ (189,011) | $ (188,961) | $ (164,705) | $ (189,011) | $ (164,705)
Balance (in shares) | 4,289 | 4,289 | 3,975 | 4,289 | 3,975
Accumulated Other Comprehensive Loss |  |  |  |  |
Balance | $ (23,267) | $ (12,144) | $ (12,268) | $ (12,144) | $ (12,551)
Other comprehensive income (loss) | (164) |  | (2,853) | (11,287) | (2,570)
Balance | $ (23,431) | $ (23,267) | $ (15,121) | $ (23,431) | $ (15,121)

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