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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Settled in Period

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Share-based Compensation Plans

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Stock based compensation.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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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.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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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).

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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.

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Number of options outstanding, including both vested and non-vested options.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Stock-Based Compensation (Textual) (Details) $ in Thousands									3 Months Ended		6 Months Ended	12 Months Ended				30 Months Ended
Stock-Based Compensation (Textual) (Details) $ in Thousands	Dec. 14, 2015 shares	Sep. 28, 2015 shares	Mar. 30, 2015 executive_officer shares	Jun. 24, 2014 shares	Jun. 19, 2012 USD ($) officer shares	Jun. 15, 2010 shares	May. 29, 2008 shares	Aug. 11, 2006 shares	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) shares	Dec. 31, 2015 USD ($) compensation_plan shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares	Dec. 31, 2012 shares	Dec. 31, 2014 USD ($) executive_officer shares
Stock-Based Compensation [Abstract]
Number of stock-based compensation plans \| compensation_plan												2
Employee Group 1 [Member]
Stock-Based Compensation [Abstract]
Stock options vesting period												3 years
Director Group 1 [Member]
Stock-Based Compensation [Abstract]
Stock options vesting period												1 year
Stock options [Member]
Stock-Based Compensation [Abstract]
Stock awards, performance units outstanding (shares)											3,337,784	3,337,784	3,325,103			3,325,103
Stock options [Member] \| Employee Group 1 [Member]
Stock-Based Compensation [Abstract]
Stock options vesting period												3 years	3 years	3 years
Performance-based restricted stock units [Member]
Stock-Based Compensation [Abstract]
Performance units forfeited in period (shares)												95,451
Shares granted (shares)												2,564,698
Maximum [Member] \| Stock options [Member] \| Director Group 1 [Member]
Stock-Based Compensation [Abstract]
Stock options vesting period												1 year	1 year	1 year
2008 Equity Incentive Plan [Member]
Stock-Based Compensation [Abstract]
Number of shares authorized for grant (shares)				10,600,000	7,600,000	5,400,000	2,000,000
Stock award, term to expiration							7 years
Number of additional shares authorized for grant (shares)				3,000,000	2,200,000	3,400,000
Ratio of shares in restricted stock awards and other full value awards to shares in amended plan						1.41
Number of shares available for future grant (shares)											1,100,000	1,100,000
2008 Equity Incentive Plan [Member] \| Stock options [Member]
Stock-Based Compensation [Abstract]
Stock options vesting period							3 years
2008 Equity Incentive Plan [Member] \| Stock options [Member] \| Director [Member]
Stock-Based Compensation [Abstract]
Stock options vesting period							1 year
2008 Equity Incentive Plan [Member] \| Performance-based restricted stock units [Member]
Stock-Based Compensation [Abstract]
Percentage of performance units (percent)	25.00%		50.00%
Percentage of fair market value (percent)	75.00%		50.00%
Requisite performance period	2 years		2 years
Selling, general and administrative expenses (less than for 2021 MIP value) \| $									$ (600)	$ (800)		$ (1,400)
2008 Equity Incentive Plan [Member] \| Performance-based restricted stock units [Member] \| Employee Group 1 [Member]
Stock-Based Compensation [Abstract]
Stock options vesting period												2 years	3 years	3 years
Number of officers \| executive_officer			8
Shares granted (shares)	45,000	1,123,333	1,325,000								1,168,333	2,493,333	120,000	599,875
2008 Equity Incentive Plan [Member] \| Performance-based restricted stock units [Member] \| Employee Group 1 [Member] \| Threshold Performance Level [Member]
Stock-Based Compensation [Abstract]
Award vesting rights (percent)	35.00%		35.00%
2008 Equity Incentive Plan [Member] \| Performance-based restricted stock units [Member] \| Employee Group 1 [Member] \| Target Performance Level [Member]
Stock-Based Compensation [Abstract]
Award vesting rights (percent)	100.00%		100.00%
2008 Equity Incentive Plan [Member] \| Performance-based restricted stock units [Member] \| Employee Group 1 [Member] \| Maximum Performance Level [Member]
Stock-Based Compensation [Abstract]
Award vesting rights (percent)			200.00%
2008 Equity Incentive Plan [Member] \| Performance-based restricted stock units [Member] \| Director Group 1 [Member]
Stock-Based Compensation [Abstract]
Shares granted (shares)												4,273	51,276	75,490
2008 Equity Incentive Plan [Member] \| Maximum [Member] \| Performance-based restricted stock units [Member] \| Director Group 1 [Member]
Stock-Based Compensation [Abstract]
Stock options vesting period												1 year	1 year	1 year
2006 Management Incentive Plan [Member] \| Performance units [Member]
Stock-Based Compensation [Abstract]
Number of shares authorized for grant (shares)								2,100,000.0
Stock options vesting period					3 years
Percentage of performance units (percent)					60.00%			60.00%
Percentage of fair market value (percent)					40.00%			40.00%
Number of officers \| officer					7
Total of performance units were outstanding and fully vested (shares)					154,264						0	0
Grant date fair value awards \| $					$ 1,200
Performance units settled in period (shares)												16,530	27,546		0	137,740
Number of executive officers that settled performance units in period (executive officers) \| executive_officer																3
Number of former executive officers that settled performance units in period (executive officers) \| executive_officer																3
Performance units forfeited in period (shares)																16,524
Number of former executive officers that forfeited performance units in period (executive officer) \| executive_officer																1
Selling, general and administrative expenses (less than for 2021 MIP value) \| $												$ 100	$ 200	$ 500
2006 Management Incentive Plan [Member] \| Common stock [Member]
Stock-Based Compensation [Abstract]
Common stock issued during period (shares)												9,918	16,526			79,356
Cash payments for shares settled during period \| $												$ 100	$ 100			$ 300
The Plans [Member]
Stock-Based Compensation [Abstract]
Unrecognized stock-based compensation expense related to stock options \| $											$ 1,900	$ 1,900
Weighted-average period for recognizing stock compensation expense												2 years
The Plans [Member] \| Selling, general and administrative expenses [Member]
Stock-Based Compensation [Abstract]
Selling, general and administrative expenses (less than for 2021 MIP value) \| $												$ 3,900	$ 4,500	$ 6,300