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Share-Based Compensation and Cash-Based Incentive Compensation - Summary of Incentive Compensation Expense (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||||||||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||||||||||
| Share-based compensation charged to operating income | $ 3,887 | $ 2,695 | $ 7,644 | $ 4,950 | ||||||
| Total charged to operating income | 5,894 | 5,466 | 12,734 | 12,644 | ||||||
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General and Administrative
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| Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||||||||||
| Share-based compensation charged to operating income | 3,887 | [1] | 2,695 | [1] | 7,644 | [1] | 4,950 | [1] | ||
| Cash-based incentive compensation charged to operating income | 1,532 | [1] | 2,024 | [1] | 3,313 | [1] | 5,554 | [1] | ||
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Lease Operating Expense
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| Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||||||||||
| Cash-based incentive compensation charged to operating income | $ 475 | $ 747 | $ 1,777 | $ 2,140 | ||||||
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