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Stock-Based Incentive Plans (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2009 | Dec. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Ownership percent of voting stock | 10.00% |  |  |  |
Aggregate intrinsic value of options exercised | $ 751,000 | $ 518,000 | $ 2,024,000 |  |
Number of shares of common stock reserved for issuance | 2,903,000 |  |  |  |
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 | $ 24.31 |  |
Aggregate fair value of restricted stock vested | $ 11,494,000 | $ 21,490,000 | $ 22,317,000 |  |
Total unrecognized compensation expense for nonvested awards | $ 9,264,000 |  |  |  |
Weighted average period over which unrecognized compensation expense will be recognized | 1 year 7 months |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Weighted average grant date fair value of restricted stock granted | $ 16.72 | $ 0.00 | $ 14.33 |  |
Aggregate fair value of restricted stock vested | $ 480,000 | $ 460,000 | $ 469,000 |  |
Total unrecognized compensation expense for nonvested awards | $ 482,000 |  |  |  |
Weighted average period over which unrecognized compensation expense will be recognized | 1 year 8 months |  |  |  |
2007 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 |  |  |  | 2.00% |
Number of shares available for grant | 0 |  |  |  | 560,000
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% |  |  |  |
2013 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Number of shares available for grant | 4,750,000 |  |  |  |
Number of shares of common stock reserved for issuance | 2,778,000 |  |  |  |
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 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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