Share-Based Compensation (Details Textual) (USD $)	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Stock option activity in shares and weighted average price
Options outstanding, beginning of period, shares	1,488,314
Options outstanding, beginning of period, weighted average price	$ 33.38
Options granted, shares	0
Options granted, weighted average price	$ 0.00
Options canceled, shares	(14,264)
Options canceled, weighted average price	$ 22.32
Options exercised, shares	0
Options exercised, weighted average price	$ 0.00
Options outstanding, end of period, shares	1,474,050
Options oustanding, end of period, weighted average price	$ 33.46
Options exercisable, end of period, shares	1,368,912
Options exercisable, end of period, weighted average price	$ 33.52
Share-based Compensation Arrangement, Additional General Disclosures [Abstract]
Tax shortfall in earnings related to share-based compensation	$ 1,700,000
Stock-based compensation expenses	2,054,000	3,015,000
Share-based compensation (capitalized)	1,100,000	1,600,000
Remaining contract life of outstanding stock options.	5 years 1 month
Remaining contract life of exercisable stock option	4 years 11 months
General and Administrative Expense [Member]
Share-based Compensation Arrangement, Additional General Disclosures [Abstract]
Stock-based compensation expenses	1,900,000	2,800,000
Lease Operating Cost [Member]
Share-based Compensation Arrangement, Additional General Disclosures [Abstract]
Stock-based compensation expenses	100,000	100,000
Employee Stock Option [Member]
Share-based Compensation Arrangement, Additional General Disclosures [Abstract]
Unrecognized compensation cost for stock grants	400,000
Weighted average remaining recognition period of cost for stock grants	11 months
Restricted Stock Awards [Member]
Restricted stock activity
Restricted shares outstanding, beginning of period, shares	1,267,110
Restricted shares outstanding, beginning of period, weighted average price	$ 21.54
Restricted shares granted, weighted average price	$ 12.32
Restricted shares granted, shares	325,550
Restricted shares canceled, weighted average price	$ 16.50
Restricted shares canceled, shares	(5,676)
Restricted shares vested, weighted average price	$ 37.10
Restricted shares vested, shares	(247,648)
Restricted shares outstanding, end of period, weighted average price	$ 16.44
Restricted shares outstanding, end of period, shares	1,339,336
Share-based Compensation Arrangement, Additional General Disclosures [Abstract]
Unrecognized compensation cost for stock grants	14,500,000
Weighted average remaining recognition period of cost for stock grants	1 year 11 months
Grant date fair value of shares vested	9,200,000
Restricted Stock Units (RSUs) [Member]
Restricted stock activity
Restricted shares outstanding, beginning of period, shares	189,700
Restricted shares outstanding, beginning of period, weighted average price	$ 15.01
Restricted shares granted, weighted average price	$ 11.68	$ 15.01
Restricted shares granted, shares	185,250	189,700
Restricted shares canceled, weighted average price	$ 0.00
Restricted shares canceled, shares	0
Restricted shares vested, weighted average price	$ 0.00
Restricted shares vested, shares	0
Restricted shares outstanding, end of period, weighted average price	$ 13.36
Restricted shares outstanding, end of period, shares	374,950
Share-based Compensation Arrangement, Additional General Disclosures [Abstract]
Unrecognized compensation cost for stock grants	$ 3,600,000
Weighted average remaining recognition period of cost for stock grants	2 years 6 months
Restricted Stock Awards Vesting Term	3 years 1 month
Minimum [Member]
Share-based Compensation Arrangement, Additional General Disclosures [Abstract]
Restricted Stock Awards Vesting Term	1 year
Percent of payout for performance based restricted stock unit grants	0.00%
Maximum Payout [Member]
Share-based Compensation Arrangement, Additional General Disclosures [Abstract]
Restricted Stock Awards Vesting Term	3 years
Percent of payout for performance based restricted stock unit grants	200.00%
Target Payout [Member]
Share-based Compensation Arrangement, Additional General Disclosures [Abstract]
Percent of payout for performance based restricted stock unit grants	100.00%

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Remaining contract life of exercisable stock option.

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Remaining contract life of outstanding stock options.

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Share-based payment award equity instrument other than options forfeited in period weighted average grant date fair value.

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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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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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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average price of options that were either forfeited or expired.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Number of share options (or share units) exercised during the current period.

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