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Supplemental disclosures to the consolidated statements of cash flows
 12 Months Ended
Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract]  
Supplemental disclosures to the consolidated statements of cash flows
Supplemental disclosures to the consolidated statements of cash flows 
Supplemental disclosures to the consolidated statements of cash flows are presented below:
 
 
Year ended December 31,
 
 
2013
 
2012
 
2011
Net cash provided by operating activities included:
 
 
 
 
 
 
Cash payments for interest
 
$
107,122

 
$
103,350

 
$
85,222

Interest capitalized
 
(15,995
)
 
(4,437
)
 
(2,379
)
Cash payments for interest, net of amounts capitalized
 
$
91,127

 
$
98,913

 
$
82,843

Cash payments for income taxes
 
$
641

 
$
255

 
$
179

Non-cash investing activities included:
 
 
 
 
 
 
Asset retirement obligation additions and revisions
 
$
9,036

 
$
1,079

 
$
2,522

Oil and natural gas properties acquired through increase (decrease) in accounts payable and accrued liabilities
 
$
27,875

 
$
24,280

 
$
(14,667
)
Non-cash financing activities included:
 
 
 
 
 
 
Modification of Time Vesting equity awards to liability plan
 
$
—

 
$
—

 
$
2,640