Annual report pursuant to Section 13 and 15(d)

Supplemental Cash Flow Information - Supplemental Cash Flow Information (Details)

Supplemental Cash Flow Information - Supplemental Cash Flow Information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Supplemental Cash Flow Elements [Abstract]      
Cash paid for interest, net of interest capitalized of $8,526 in 2014, $10,058 in 2013 and $13,274 in 2012 $ 77,607us-gaap_InterestPaidNet $ 73,909us-gaap_InterestPaidNet $ 46,247us-gaap_InterestPaidNet
Cash paid for income taxes   3,000us-gaap_IncomeTaxesPaid 16,056us-gaap_IncomeTaxesPaid
Cash refunds received for income taxes 3,000us-gaap_ProceedsFromIncomeTaxRefunds 59,126us-gaap_ProceedsFromIncomeTaxRefunds 479us-gaap_ProceedsFromIncomeTaxRefunds
Cash paid for share-based compensation 431us-gaap_DividendsShareBasedCompensationCash [1] 466us-gaap_DividendsShareBasedCompensationCash [1] 1,531us-gaap_DividendsShareBasedCompensationCash [1]
Cash tax benefit related to share-based compensation $ 0wti_CashTaxBenefitRelatedToShareBasedCompensation [2] $ 0wti_CashTaxBenefitRelatedToShareBasedCompensation [2] $ 5,962wti_CashTaxBenefitRelatedToShareBasedCompensation [2]
[1] The cash paid for share-based compensation is for dividends on unvested restricted stock and for dividend equivalents paid on RSUs. No cash was received from employees or directors related to share-based compensation and no cash was used to settle any equity instruments granted under share-based compensation arrangements.
[2] The cash tax benefit for share-based compensation is attributable to tax deductions for vested restricted shares, vested RSUs, dividends paid on unvested restricted stock and dividend equivalents paid on RSUs. For 2014 and 2013, no cash tax benefit was realized as the Company had a tax loss for that year and all carrybacks had previously been utilized.