Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation and Cash-Based Incentive Compensation - Summary of Incentive Compensation Expense (Details)

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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
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
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
General and Administrative
       
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]
Lease Operating Expense
       
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
[1] Reclassified $0.7 million from cash-based incentive compensation expense to share-based compensation expense in the six months ended June 30, 2014 related to the CEO’s 2013 award.