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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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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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The weighted average fair value at grant date for nonvested equity-based awards issued 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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Gross number of share options (or share units) granted during the period.

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

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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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Stock-Based Compensation (Textual) (Details) $ / shares in Units, $ in Thousands															3 Months Ended		6 Months Ended	12 Months Ended				30 Months Ended
	Aug. 03, 2016 shares	Jun. 27, 2016 shares	Jun. 20, 2016 shares	May 05, 2016 shares	Apr. 27, 2016 $ / shares shares	Mar. 31, 2016 executive_officer shares	Dec. 14, 2015 shares	Sep. 28, 2015 shares	Mar. 30, 2015 executive_officer shares	Jun. 24, 2014 shares	Jun. 19, 2012 USD ($) officer shares	Jun. 15, 2010 shares	May 29, 2008 shares	Aug. 11, 2006 shares	Dec. 31, 2015 USD ($) shares	Jun. 30, 2015 USD ($)	Dec. 31, 2015 shares	Dec. 31, 2016 USD ($) compensation_plan $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2012 shares	Dec. 31, 2014 USD ($) executive_officer shares	Sep. 30, 2016 employee	Jun. 30, 2016 executive_officer employee
Stock-Based Compensation [Abstract]
Number of stock-based compensation plans \| compensation_plan																		2
Performance units to be settled in equity (in shares)																		560,670,000	954,583,000
Performance units to be settled in cash (in shares)																		790,080,000	1,538,750,000
Director [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Shares granted (shares)																		20,000
Stock-Based Compensation [Abstract]
Stock options vesting period																		1 year
Employee Group 1 [Member]
Stock-Based Compensation [Abstract]
Stock options vesting period																		3 years
Stock options [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Shares granted (shares)																		462,917
Stock-Based Compensation [Abstract]
Stock awards, performance units outstanding (shares)															3,337,784		3,337,784	3,420,385	3,337,784
Stock options [Member] \| Employee Group 1 [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Shares granted (shares)																		35,000	17,092	1,480,000
Stock-Based Compensation [Abstract]
Stock options vesting period																		3 years	3 years	3 years
Weighted Average Grant Date Fair Value, Granted (usd per share) \| $ / shares																		$ 2.66	$ 1.33	$ 1.81
Performance-based restricted stock units [Member]
Stock-Based Compensation [Abstract]
Performance units forfeited in period (shares)																		174,170
Shares granted (shares)																		1,550,750
Weighted Average Grant Date Fair Value, Granted (usd per share) \| $ / shares																		$ 4.86	$ 4.00	$ 6.29
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)																		600,000
Weighted-average period for recognizing stock compensation expense																		13 months 25 days
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)									50.00%
Percentage of fair market value (percent)									50.00%
Requisite performance period									2 years
Selling, general and administrative expenses (less than for 2021 MIP value) \| $															$ (800)	$ (600)			$ (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	2 years	3 years
Number of officers \| executive_officer						5			8
Shares granted (shares)									1,325,000								1,168,333	1,250,750	2,493,333	120,000
Weighted Average Grant Date Fair Value, Granted (usd per share) \| $ / shares																		$ 4.88	$ 3.99	$ 6.36
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%
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%
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] \| Stock Appreciation Rights (SARs) [Member] \| Chief Executive Officer [Member]
Stock-Based Compensation [Abstract]
Shares granted (shares)					200,000
Weighted Average Grant Date Fair Value, Granted (usd per share) \| $ / shares					$ 4.71
2008 Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Stock-Based Compensation [Abstract]
Shares granted (shares)																		1,350,750,000	2,493,333,000
2008 Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| Senior Business Leader [Member]
Stock-Based Compensation [Abstract]
Percentage of performance units (percent)	43.00%		40.00%	43.00%		43.00%		25.00%
Performance units, percentage of units settled	57.00%	60.00%		57.00%		57.00%		75.00%
Shares granted (shares)	10,000		30,000	60,000		609,000	45,000	1,123,333
Requisite performance period	2 years	2 years	2 years	2 years		2 years		2 years
2008 Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| Senior Business Leader [Member] \| Threshold Performance Level [Member]
Stock-Based Compensation [Abstract]
Award vesting rights (percent)	35.00%	35.00%	35.00%	35.00%		35.00%		35.00%
2008 Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| Senior Business Leader [Member] \| Target Performance Level [Member]
Stock-Based Compensation [Abstract]
Award vesting rights (percent)	100.00%		100.00%	100.00%		100.00%		100.00%
2008 Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| Senior Business Leader [Member] \| Maximum Performance Level [Member]
Stock-Based Compensation [Abstract]
Award vesting rights (percent)	150.00%		150.00%	150.00%		150.00%
2008 Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| Director [Member]
Stock-Based Compensation [Abstract]
Number Of Employees \| employee																								1
2008 Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| Employee Group 1 [Member]
Stock-Based Compensation [Abstract]
Percentage of performance units (percent)		40.00%
Performance units, percentage of units settled		60.00%
Number Of Employees \| employee																								1
Shares granted (shares)		641,750
2008 Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| Employee Group 1 [Member] \| Target Performance Level [Member]
Stock-Based Compensation [Abstract]
Award vesting rights (percent)		100.00%
2008 Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| Employee Group 1 [Member] \| Maximum Performance Level [Member]
Stock-Based Compensation [Abstract]
Award vesting rights (percent)		150.00%
2008 Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| Executive Officer [Member]
Stock-Based Compensation [Abstract]
Number of officers \| executive_officer																								5
2008 Equity Incentive Plan [Member] \| Restricted Stock [Member] \| Employee Group 1 [Member]
Stock-Based Compensation [Abstract]
Number Of Employees \| employee																							3
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
Grant date fair value awards \| $											$ 1,200
Performance units to be settled in equity (in 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) \| $																		$ 0	$ 100	$ 200
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 \| $																		5,800
The Plans [Member] \| Selling, general and administrative expenses [Member]
Stock-Based Compensation [Abstract]
Selling, general and administrative expenses (less than for 2021 MIP value) \| $																		$ 5,100	$ 3,900	$ 4,500