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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Basic EPS Two Class Method:      
Net Income $ (477,077)us-gaap_NetIncomeLoss $ 5,442us-gaap_NetIncomeLoss $ (283,427)us-gaap_NetIncomeLoss
Income, share amounts 44,232,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 43,628,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic  
Earnings Per Share, Basic $ (10.79)us-gaap_EarningsPerShareBasic $ 0.12us-gaap_EarningsPerShareBasic  
Dilutive Securities:      
Dilutive RSA's, Shares 0us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends 420,000us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends  
Dilutive RSU's, Shares 0us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares 70,000us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares  
Diluted EPS:      
Net Income (Loss) Available to Common Stockholders, Diluted $ (477,077)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 5,442us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted  
Weighted Average Number of Shares Outstanding, Diluted 44,232,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 44,118,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding  
Earnings Per Share, Diluted $ (10.79)us-gaap_EarningsPerShareDiluted $ 0.12us-gaap_EarningsPerShareDiluted  
Stock Options [Member]      
Earnings Per Share (Textual)      
Antidilutive shares excluded from EPS, shares 1,300,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1,500,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Restricted Stock [Member]      
Earnings Per Share (Textual)      
Antidilutive shares excluded from EPS, shares 700,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
400,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Restricted Stock Units (RSUs) [Member]      
Earnings Per Share (Textual)      
Contingently Issuable Shares Not Included in Diluted EPS 1,200,000sfy_ContingentlyIssuableSharesNotIncludedinDilutedEPS
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
700,000sfy_ContingentlyIssuableSharesNotIncludedinDilutedEPS
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember