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Revised Financial Statements (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net cash provided (used) by:    
Operating activities $ 10,473us-gaap_NetCashProvidedByUsedInOperatingActivities $ 27,484us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing activities (34,897)us-gaap_NetCashProvidedByUsedInInvestingActivities (65,541)us-gaap_NetCashProvidedByUsedInInvestingActivities
As Previously Reported    
Net cash provided (used) by:    
Operating activities   27,528us-gaap_NetCashProvidedByUsedInOperatingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Investing activities   (65,585)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Revision    
Net cash provided (used) by:    
Operating activities   (44)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
Investing activities   $ 44us-gaap_NetCashProvidedByUsedInInvestingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember