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Stockholders' Equity - Schedule of common stock (Details) - shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued beginning balance (In shares) | 70,079,747 | 70,363,251 | 70,596,559 | 69,818,392
Repurchase of common stock (in shares) | (392,700) | (434,766) | (1,175,609) | (594,799)
Awards effectively repurchased for required employee withholding taxes (in shares) | (81,007) | (92,462) | (182,911) | (204,266)
Shares issued ending balance (In shares) | 69,991,145 | 70,573,887 | 69,991,145 | 70,573,887
Issuance of common stock from vested restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Issuance of common stock from vested restricted stock units (in shares) | 213,991 | 389,875 | 500,710 | 1,000,141
Issuance of common stock from exercise of stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Issuance of common stock from exercise of stock options (in shares) | 58,491 | 263,464 | 139,773 | 469,894
Issuance of common stock for employee stock purchase plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Issuance of common stock for employee stock purchase plan (in shares) | 112,623 | 84,525 | 112,623 | 84,525

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + 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 + Details
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