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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2014 | $ 2,905,810 | $ 1,893 | $ 984,674 | $ 2,811,815 | $ 6,463 | $ (899,035)
Beginning Balance (in shares) at Dec. 31, 2014 |  | 189,263,000 |  |  |  |
Net income (loss) | (294,486) |  |  | (294,486) |  |
Foreign currency translation adjustment | (10,556) |  |  |  | (10,556) |
Issuance of restricted stock |  | $ 12 | (12) |  |  |
Issuance of restricted stock (in shares) |  | 1,180,000 |  |  |  |
Vesting of restricted stock units (in shares) |  | 14,000 |  |  |  |
Forfeitures of restricted stock |  | $ (1) | 1 |  |  |
Forfeitures of restricted stock (in shares) |  | (82,000) |  |  |  |
Stock-based compensation | 28,510 |  | 28,510 |  |  |
Tax expense related to stock-based compensation | (1,362) |  | (1,362) |  |  |
Payment of cash dividends | (58,775) |  |  | (58,775) |  |
Purchase of treasury stock | (8,010) |  |  |  |  | (8,010)
Ending Balance at Dec. 31, 2015 | 2,561,131 | $ 1,904 | 1,011,811 | 2,458,554 | (4,093) | (907,045)
Ending Balance (in shares) at Dec. 31, 2015 |  | 190,375,000 |  |  |  |
Net income (loss) | (318,634) |  |  | (318,634) |  |
Foreign currency translation adjustment | 2,959 |  |  |  | 2,959 |
Shares issued for acquisitions | 6,733 | $ 3 | 6,730 |  |  |
Shares issued for acquisitions (in shares) |  | 354,000 |  |  |  |
Issuance of restricted stock |  | $ 8 | (8) |  |  |
Issuance of restricted stock (in shares) |  | 785,000 |  |  |  |
Vesting of restricted stock units (in shares) |  | 15,000 |  |  |  |
Forfeitures of restricted stock (in shares) |  | (43,000) |  |  |  |
Exercise of stock options | 707 |  | 707 |  |  |
Exercise of stock options (in shares) |  | 40,000 |  |  |  |
Stock-based compensation | 28,324 |  | 28,324 |  |  |
Tax expense related to stock-based compensation | (4,868) |  | (4,868) |  |  |
Payment of cash dividends | (23,579) |  |  | (23,579) |  |
Purchase of treasury stock | (4,049) |  |  |  |  | (4,049)
Ending Balance at Dec. 31, 2016 | $ 2,248,724 | $ 1,915 | 1,042,696 | 2,116,341 | (1,134) | (911,094)
Ending Balance (in shares) at Dec. 31, 2016 | 191,525,872 | 191,526,000 |  |  |  |
Net income (loss) | $ 5,910 |  |  | 5,910 |  |
Foreign currency translation adjustment | 7,956 |  |  |  | 7,956 |
Equity offering | 471,570 | $ 182 | 471,388 |  |  |
Equity offering (in shares) |  | 18,170,000 |  |  |  |
Shares issued for acquisitions | 1,226,890 | $ 551 | 1,226,339 |  |  |
Shares issued for acquisitions (in shares) |  | 55,097,000 |  |  |  |
Issuance of restricted stock |  | $ 9 | (9) |  |  |
Issuance of restricted stock (in shares) |  | 891,000 |  |  |  |
Vesting of restricted stock units |  | $ 5 | (5) |  |  |
Vesting of restricted stock units (in shares) |  | 549,000 |  |  |  |
Forfeitures of restricted stock (in shares) |  | (24,000) |  |  |  |
Exercise of stock options | $ 931 |  | 931 |  |  |
Exercise of stock options (in shares) | 50,000 | 50,000 |  |  |  |
Stock-based compensation | $ 44,483 |  | 44,483 |  |  |
Payment of cash dividends | (16,315) |  |  | (16,315) |  |
Dividend equivalents | (39) |  |  | (39) |  |
Purchase of treasury stock | (7,617) |  |  |  |  | (7,617)
Ending Balance at Dec. 31, 2017 | $ 3,982,493 | $ 2,662 | $ 2,785,823 | $ 2,105,897 | $ 6,822 | $ (918,711)
Ending Balance (in shares) at Dec. 31, 2017 | 266,259,083 | 266,259,000 |  |  |  |

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