CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
(Loss) gain on 1.125% Call Option
Percentage of contractual interest rate	1.125%	1.125%	1.125%
Gain (loss) on 1.125% Conversion Option
Percentage of contractual interest rate	1.125%		1.125%

Fixed interest rate related to the interest rate derivative.

No definition available.

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant