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Share-Based Compensation (Compensation Expense of Nonvested Shares) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Nonvested time-based shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Remaining 2015 $ 1,287swc_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedToBeRecognizedInRemainderofFiscalYear
/ us-gaap_AwardTypeAxis
= swc_TimeBasedRestrictedStockUnitsMember
2016 1,534swc_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotyetRecognizedToBeRecognizedinYearTwo
/ us-gaap_AwardTypeAxis
= swc_TimeBasedRestrictedStockUnitsMember
2017 624swc_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotyetRecognizedToBeRecognizedinYearThree
/ us-gaap_AwardTypeAxis
= swc_TimeBasedRestrictedStockUnitsMember
2018 1swc_EmployeeServiceSharebasedCompensationNonvestedAwardsTotalCompensationCostToBeRecognizedInYearFour
/ us-gaap_AwardTypeAxis
= swc_TimeBasedRestrictedStockUnitsMember
Total 3,446us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= swc_TimeBasedRestrictedStockUnitsMember
Nonvested performance-based shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Remaining 2015 1,224swc_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedToBeRecognizedInRemainderofFiscalYear
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
2016 1,631swc_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotyetRecognizedToBeRecognizedinYearTwo
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
2017 868swc_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotyetRecognizedToBeRecognizedinYearThree
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
2018 0swc_EmployeeServiceSharebasedCompensationNonvestedAwardsTotalCompensationCostToBeRecognizedInYearFour
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Total $ 3,723us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember