Share-Based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock-Based Compensation Plan
Shares available from canceled share-based compensation plans	0
Percentage of fair value of the common stock equal to exercise price	100.00%
Number of Matured Shares Delivered in Stock Swap Transactions	0	0	10,752
Percentage of payroll deductions	10.00%
Percentage of purchase price for stock acquired under the plan	85.00%
Number of shares issued under employee stock purchase plan	87,629	71,825	72,273
Purchase price of shares issued under employee stock purchase plan	$ 3.44	$ 11.47	$ 13.08
Actual income tax benefit from excise of stock options			$ 0
Share-based compensation expenses	$ 4,435	$ 7,309	10,099
Share-based compensation (capitalized)	1,400	3,500	5,500
Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 0
Remaining contract life of outstanding stock options.	3 years 9 months
Remaining contract life of exercisable stock option	3 years 9 months
Intrinsic value of exercised stock option	$ 0	0	0
Employee Stock Ownership Plan
Minimum age to participate for ESOP	21 years
Shares in ESOP	0
Amount contributed to ESOP	$ 0	0	$ 200
Shares of common stock contributed to ESOP			14,815
Employee Savings Plan [Abstract]
Employee Savings Plan, Employer Matching Contribution, Percent	100.00%
Employee Savings Plan, Maximum Annual Contribution Per Employee, Percent	6.00%
Employee Savings Plan, Employer Discretionary Contribution Amount	$ 700	1,900	$ 1,800
Defined Contribution Plan, Employer Discretionary Contribution Amount Paid in Cash		$ 900
Employee Savings Plan, Stock Issued During Period, Shares		352,476	139,850
General and Administrative Expense [Member]
Stock-Based Compensation Plan
Share-based compensation expenses	4,100	$ 6,700	$ 9,300
Operating Lease Expense [Member]
Stock-Based Compensation Plan
Share-based compensation expenses	$ 200	$ 200	$ 300
Employee Stock Option [Member]
Stock-Based Compensation Plan
Reduction in shares available for future grant by restricted stock	1.0
Stock Option Awards
Look back period used to estimate expected volatility of stock option grants	5 years 6 months
Restricted Stock Awards [Abstract]
Unrecognized compensation cost related to stock awards	$ 0
Restricted Stock Awards [Member]
Stock-Based Compensation Plan
Reduction in shares available for future grant by restricted stock	1.44
Restricted Stock Awards [Abstract]
Number of shares issued to employees, consultants and directors	609,238	747,400	869,430
Fair value of non-option shares granted	$ 2.64	$ 11.55	$ 14.86
Unrecognized compensation cost related to stock awards	$ 3,600
Weighted average recognition period of cost related to stock awards	1 year 2 months
Grant date fair value of shares vested	$ 6,100	$ 11,800	$ 12,800
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	609,238
Performance Awards (RSUs) [Member]
Stock-Based Compensation Plan
Reduction in shares available for future grant by restricted stock	1.44
Restricted Stock Awards [Abstract]
Number of shares issued to employees, consultants and directors	216,450	185,250	189,700
Vesting period	3 years 1 month
Fair value of non-option shares granted	$ 1.98	$ 11.68	$ 15.01
Unrecognized compensation cost related to stock awards	$ 900
Weighted average recognition period of cost related to stock awards	1 year 6 months
Restricted Stock Units [Abstract]
Performance Period for RSUs	3 years
Percent of payout for performance based restricted stock unit grants	100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	216,450
Cash-settled Restricted Stock Unit (RSUs) [Member]
Restricted Stock Units [Abstract]
Performance Period for RSUs	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	147,812
Minimum Payout [Member] \| Restricted Stock Awards [Member]
Restricted Stock Awards [Abstract]
Vesting period	3 years
Maximum Payout [Member]
Employee Stock Ownership Plan
Criteria for ESOP	1 year
Maximum Payout [Member] \| Performance Awards (RSUs) [Member]
Restricted Stock Units [Abstract]
Percent of payout for performance based restricted stock unit grants	200.00%
Employee Stock Purchase Plan [Member]
Stock-Based Compensation Plan
Shares available for future grant under stock compensation plans	318,027
Share-Based Compensation Plan [Member]
Stock-Based Compensation Plan
Shares available for future grant under stock compensation plans	1,253,306

Defined Contribution Plan, Employer Discretionary Contribution Amount Paid in Cash

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Look back period used to estimate expected volatility of stock option grants

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Minimum Age to Participate

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Number of Matured shares delivered in stock swap transactions.

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Purchase price of shares issued under employee stock purchase plan.

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Reduction in shares available for future grant

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Remaining contract life of outstanding stock options.

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Share based compensation arrangement by share based payment award percentage of exercise price on fair value.

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Share based compensation arrangement by share based payment award percentage purchase price for stock acquired under employee stock purchase plan.

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Shares available from canceled share-based compensation plans

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Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, 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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This item represents the amount of cash contributions during the period made by the entity to the Employee Stock Ownership Plan (ESOP).

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This item represents the number of shares provided to the Employee Stock Ownership Plan (ESOP) during the period.

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Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan.

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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.

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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 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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of share instruments newly issued under a share-based compensation plan.

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Expected term of share-based compensation awards, 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 issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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