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Stock-Based Incentive Plans (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Apr. 26, 2016
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Non-cash stock compensation | $ 9,062,000 | $ 11,048,000 | $ 18,115,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock Units, Grants in Period, Weighted Average Grant Date Fair Value | $ 0.00 | $ 16.72 | $ 14.33 |
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock Units, Vested in Period, Fair Value | $ 324,000 | $ 480,000 | $ 460,000 |
Ownership percent of voting stock | 10.00% |  |  |
Aggregate intrinsic value of options exercised | $ 344,000 | 751,000 | 518,000 |
Weighted average grant date fair value of restricted stock granted | $ 3.12 |  |  |
Number of shares of common stock reserved for issuance | 7,445,000 |  |  |
Restricted stock awards with time based vesting conditions [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Non-cash stock compensation | $ 0 | $ 10,575,000 | $ 17,631,000 |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Weighted average grant date fair value of restricted stock granted |  | $ 12.83 | $ 14.41 |
Aggregate fair value of restricted stock vested | 5,243,000 | $ 11,494,000 | $ 21,490,000 |
Total unrecognized compensation expense for nonvested awards | $ 1,873,000 |  |  |
Weighted average period over which unrecognized compensation expense will be recognized | 1 year |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Total unrecognized compensation expense for nonvested awards | $ 162,000 |  |  |
Weighted average period over which unrecognized compensation expense will be recognized | 1 year |  |  |
Restricted stock unit awards with time-based vesting conditions [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Non-cash stock compensation | $ 4,391,000 | 473,000 | 484,000 |
Restricted stock unit awards with performance based vesting conditions [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Non-cash stock compensation | 197,000 | 0 | 0 |
Stock options with time-based vesting conditions [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Non-cash stock compensation | 1,316,000 | 0 | 0 |
Stock options with market-based vesting conditions [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Non-cash stock compensation | 3,158,000 | 0 | 0 |
Stock options with performance-based vesting conditions [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Non-cash stock compensation | $ 0 | $ 0 | $ 0 |
2007 Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Number of shares available for grant | 0 |  |  |
2016 Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Aggregate shares available for issuance |  |  |  | 4,500,000
Number of shares available for grant | 1,754,000 |  |  |
Discretionary Option Grant Program [Member] | Nonstatutory Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Percentage of fair market value on grant date, minimum exercise price | 85.00% |  |  |
Stock Issuance Program [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Percentage of fair market value on grant date, minimum exercise price | 100.00% |  |  |
2002 Stock Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Increase in number of shares available, percentage of outstanding shares on last trading day of prior December | 3.00% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Increase | 500,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Available for Issuance | 20,000,000 |  |  |
Number of shares available for grant | 0 |  |  |
2013 Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Number of shares available for grant | 4,750,000 |  |  |
2013 Stock Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Number of shares available for grant |  |  |  | 625,390
Less than 10% [Member] | Discretionary Option Grant Program [Member] | Incentive Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Percentage of fair market value on grant date, minimum exercise price | 100.00% |  |  |
10% or More [Member] | Discretionary Option Grant Program [Member] | Incentive Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Percentage of fair market value on grant date, minimum exercise price | 110.00% |  |  |

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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=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + 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=6415400&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=6415400&loc=d3e5070-113901 + Details
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