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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 | 9 Months Ended | ||||||||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 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 | $ 3,754 | $ 3,507 | $ 11,398 | $ 8,457 | ||||||
| Total charged to operating income | 7,064 | 6,422 | 19,799 | 19,066 | ||||||
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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 | 3,754 | [1] | 3,507 | [1] | 11,398 | [1] | 8,457 | [1] | ||
| Cash-based incentive compensation charged to operating income | 2,724 | [1] | 2,191 | [1] | 6,038 | [1] | 7,745 | [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 | $ 586 | $ 724 | $ 2,363 | $ 2,864 | ||||||
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