Share-Based Compensation (Details Textual) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Share-Based Compensation (Details Textual)
Tax shortfall in earnings related to share-based compensation	$ 1,200,000	$ 1,700,000
Stock-based compensation expenses	879,000us-gaap_ShareBasedCompensation	1,784,000us-gaap_ShareBasedCompensation
Share-based compensation (capitalized)	300,000	1,100,000
Remaining contract life of outstanding stock options.	4 years 6 months
Remaining contract life of exercisable stock option	4 years 6 months
Required stock price for payout on performance based restricted stock units	$ 5.22
Percent of payout for performance based restricted stock unit grants	100.00%
Restricted Stock Awards [Member]
Restricted stock activity
Restricted shares outstanding, beginning of period, shares	1,414,012
Restricted shares outstanding, beginning of period, weighted average price	$ 14.81
Restricted shares granted, shares	313,600
Restricted shares granted, weighted average price	$ 3.05
Restricted shares canceled, shares	(177,556)
Restricted shares canceled, weighted average price	$ 14.63
Restricted shares vested, shares	(177,618)
Restricted shares vested, weighted average price	$ 24.20
Restricted shares outstanding, end of period, shares	1,372,438
Restricted shares outstanding, end of period, weighted average price	$ 10.93
Share-Based Compensation (Details Textual)
Unrecognized compensation cost for stock grants	7,300,000
Weighted average remaining recognition period of cost for stock grants	1 year 8 months
Grant date fair value of shares vested	4,300,000
Restricted Stock Units (RSUs) [Member]
Restricted stock activity
Restricted shares outstanding, beginning of period, shares	374,950
Restricted shares outstanding, beginning of period, weighted average price	$ 13.36
Restricted shares granted, shares	216,450
Restricted shares granted, weighted average price	$ 1.98
Restricted shares canceled, shares	0
Restricted shares canceled, weighted average price	$ 0.00
Restricted shares vested, shares	0
Restricted shares vested, weighted average price	$ 0.00
Restricted shares outstanding, end of period, shares	591,400
Restricted shares outstanding, end of period, weighted average price	$ 9.20
Share-Based Compensation (Details Textual)
Unrecognized compensation cost for stock grants	1,300,000
Weighted average remaining recognition period of cost for stock grants	2 years 1 month
Restricted Stock Awards Vesting Term	3 years 0 months
Minimum [Member]
Share-Based Compensation (Details Textual)
Percent of payout for performance based restricted stock unit grants	0.00%
Restricted Stock Awards Vesting Term	1 year
Maximum Payout [Member]
Share-Based Compensation (Details Textual)
Percent of payout for performance based restricted stock unit grants	200.00%
Restricted Stock Awards Vesting Term	3 years
General and Administrative Expense [Member]
Share-Based Compensation (Details Textual)
Stock-based compensation expenses	800,000	1,600,000
Lease Operating Cost [Member]
Share-Based Compensation (Details Textual)
Stock-based compensation expenses	$ 100,000	$ 100,000

Percent of payout for performance based restricted stock unit grants

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Remaining contract life of exercisable stock option.

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Amount of decrease in additional paid in capital (APIC) resulting from a tax deficiency associated with a share-based compensation plan other than an employee stock ownership plan (ESOP).

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

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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

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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 weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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