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Stockholders' Equity - Discussion of Equity and Warrants (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 26, 2018 | May 20, 2015 | Dec. 31, 2018 | Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 20, 2018 | Dec. 31, 2015
Stockholders’ Equity and Regulatory Matters [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  | $ 1,903,211,000 |  |  |  | $ 1,903,211,000 | $ 1,928,255,000 | $ 1,855,473,000 |  | $ 938,095,000
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjustment to additional paid-in capital from convertible notes issued |  |  |  |  |  |  | $ 15,045,000 | 0 | 0 |  |
Share repurchase program, authorized amount | $ 100,000,000.0 |  |  |  |  |  |  |  |  | $ 50,000,000 |
Common stock repurchased and recorded as treasury stock (in shares) |  |  | 3,436,757 |  |  | 5,565,696 | 9,000,000 |  |  |  |
Repurchase of treasury stock |  |  | $ 50,000,000 |  | $ 100,000,000 |  | $ 150,000,000 |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares repurchased under warrant to purchase |  | 350,767 |  |  |  |  |  |  |  |  |
Payments for purchase of warrants |  | $ 1,200,000 |  |  |  |  |  |  |  |  |
Outstanding warrants |  |  | 0 |  |  |  | 0 |  |  |  |
Additional paid-in capital |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Regulatory Matters [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  | $ 1,423,405,000 |  |  |  | $ 1,423,405,000 | $ 1,405,014,000 | $ 1,400,490,000 |  | $ 541,596,000
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |
Adjustment to additional paid-in capital from convertible notes issued |  |  |  | $ 21,400,000 |  |  | 15,045,000 |  |  |  |
Tax adjustment on equity component of convertible notes, reduction to additional paid-in capital |  |  |  | 6,400,000 |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity component of convertible notes, net of taxes |  |  |  | 21,900,000 |  |  |  |  |  |  |
Issuance costs from convertible notes allocated to equity |  |  |  | $ 461,000 |  |  |  |  |  |  |
Repurchase of treasury stock | $ 76,000,000 |  |  |  |  |  | $ 150,000,000 |  |  |  |

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- Definition The aggregate amount paid by the entity to reacquire the right to purchase equity shares at a predetermined price, usually issued together with corporate debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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