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Stockholders' Equity and Stock Incentive Plans (Stock Options) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
May 17, 2012 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | May 16, 2012
Stock Options Activity [Roll Forward] |  |  |  |  |
Outstanding, beginning of period |  | 3,107,916 | 4,605,055 | 7,169,668 |
Granted |  | 0 | 216,509 | 200,673 |
Canceled |  | (1,323,500) | (1,260,750) | (1,463,497) |
Exercised |  | (241,964) | (452,898) | (1,301,789) |
Outstanding, end of period |  | 1,542,452 | 3,107,916 | 4,605,055 |
Exercisable |  | 1,335,717 | 2,696,315 |  |
Stock Options Activity, Weighted Average Option Price [Roll Forward] |  |  |  |  |
Outstanding, weighted average option price, beginning of period (in USD per share) |  | $ 23.36 | $ 26.14 | $ 25.73 |
Granted, weighted average option price (in USD per share) |  | 0.00 | 17.50 | 19.98 |
Canceled, weighted average option price (in USD per share) |  | 39.30 | 38.63 | 39.82 |
Exercised, weighted average option price (in USD per share) |  | 8.61 | 6.49 | 7.53 |
Outstanding, weighted average option price, end of period (in USD per share) |  | 11.99 | 23.36 | $ 26.14 |
Exercisable, weighted average option price (in USD per share) |  | $ 11.00 | $ 24.27 |  |
Additional Disclosures: |  |  |  |  |
Outstanding, weighted average remaining term |  | 5 years 3 months 24 days |  |  |
Exercisable, weighted average remaining term |  | 4 years 9 months 20 days | 3 years 1 month 6 days |  |
Outstanding, aggregate intrinsic value |  | $ 35,565 |  |  |
Exercisable, aggregate intrinsic value |  | 32,128 | $ 14,587 |  |
Total intrinsic value of in-the-money options exercised during the period |  | 3,900 | 5,900 | $ 11,100 |
Total fair value of options vested in period |  | 1,600 | $ 2,000 | $ 1,900 |
Stock Options |  |  |  |  |
Additional Disclosures: |  |  |  |  |
Total unrecognized share-based compensation costs related to unvested stock options |  | $ 200 |  |  |
Total unrecognized share-based compensation costs related to unvested stock options, period for recognition |  | 1 year 4 months 26 days |  |  |
Stock Incentive Plan 2012 [Member] | Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Term of stock incentive plan | 10 years |  |  |  |
Increase in number of common shares authorized under Stock Incentive Plan | 4,000,000 |  |  |  |
Number of common shares authorized for issuance under Stock Incentive Plan | 21,000,000 |  |  |  | 17,000,000
Number of common shares available for grant under Stock Incentive Plan |  | 4,400,000 |  |  |
Number of authorized and unissued common shares under Stock Incentive Plan |  | 9,700,000 |  |  |
Award vesting period |  | 3 years |  |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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