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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)
Mar. 31, 2015
Debt Instrument, Interest Rate, Stated Percentage 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
Convertible Notes Payable [Member]  
Debt Instrument, Interest Rate, Stated Percentage 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
Convertible Notes Payable [Member] | Senior Notes [Member]  
Debt Instrument, Interest Rate, Stated Percentage 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember