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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, 2016 | $ 2,248,724 | $ 1,915 | $ 1,042,696 | $ 2,116,341 | $ (1,134) | $ (911,094)
Beginning Balance (in shares) at Dec. 31, 2016 |  | 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 |  |  |  |
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 |  | 266,259,000 |  |  |  |
Net income (loss) | (321,421) |  |  | (321,421) |  |
Foreign currency translation adjustment | (4,335) |  |  |  | (4,335) |
Restricted stock issued for acquisition | 2,932 | $ 2 | 2,930 |  |  |
Restricted stock issued for acquisition (in shares) |  | 192,000 |  |  |  |
Issuance of restricted stock |  | $ 4 | (4) |  |  |
Issuance of restricted stock (in shares) |  | 381,000 |  |  |  |
Vesting of restricted stock units |  | $ 5 | (5) |  |  |
Vesting of restricted stock units (in shares) |  | 452,000 |  |  |  |
Forfeitures of restricted stock (in shares) |  | (8,000) |  |  |  |
Exercise of stock options | 485 |  | 485 |  |  |
Exercise of stock options (in shares) |  | 40,000 |  |  |  |
Stock-based compensation | 37,925 |  | 37,925 |  |  |
Payment of cash dividends | (30,589) |  |  | (30,589) |  |
Dividend equivalents | (330) |  |  | (330) |  |
Purchase of treasury stock | (161,737) |  |  |  |  | (161,737)
Ending Balance at Dec. 31, 2018 | $ 3,505,423 | $ 2,673 | 2,827,154 | 1,753,557 | 2,487 | (1,080,448)
Ending Balance (in shares) at Dec. 31, 2018 | 267,315,526 | 267,316,000 |  |  |  |
Net income (loss) | $ (425,703) |  |  | (425,703) |  |
Foreign currency translation adjustment | 2,991 |  |  |  | 2,991 |
Issuance of restricted stock |  | $ 2 | (2) |  |  |
Issuance of restricted stock (in shares) |  | 185,000 |  |  |  |
Vesting of restricted stock units |  | $ 12 | (12) |  |  |
Vesting of restricted stock units (in shares) |  | 1,173,000 |  |  |  |
Forfeitures of restricted stock (in shares) |  | (2,000) |  |  |  |
Exercise of stock options | $ 9,219 | $ 7 | 9,212 |  |  |
Exercise of stock options (in shares) | 700,000 | 700,000 |  |  |  |
Stock-based compensation | $ 39,328 |  | 39,328 |  |  |
Payment of cash dividends | (32,428) |  |  | (32,428) |  |
Dividend equivalents | (524) |  |  | (524) |  |
Purchase of treasury stock | (264,686) |  |  |  |  | (264,686)
Ending Balance at Dec. 31, 2019 | $ 2,833,620 | $ 2,694 | $ 2,875,680 | $ 1,294,902 | $ 5,478 | $ (1,345,134)
Ending Balance (in shares) at Dec. 31, 2019 | 269,372,257 | 269,372,000 |  |  |  |

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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
Name: | us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration