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Notes Payable and Debt and Financing Arrangements - Letter of credit summary (Details) - USD ($)
$ in Thousands

Mar. 31, 2016

Dec. 31, 2015

Dec. 31, 2014

Letter of credit facility

Line of Credit Facility [Line Items]

Available letter of credit facilities - commitments

$ 4,503,617

^[1]

$ 4,463,041

^[1],[2],[3]

$ 3,575,000

^[2],[3]

Available letter of credit facilities - in use

$ 2,548,085

$ 2,515,653

^[1],[3],[4]

$ 1,790,561

^[3]

Collateralized by certain assets of the Company's investment portfolio

51.30%

^[1]

50.90%

^[1],[3]

66.20%

^[3]

Revolving credit facility

Line of Credit Facility [Line Items]

Available letter of credit facilities - commitments

$ 1,400,000

$ 1,400,000

$ 1,600,000

Available letter of credit facilities - in use

$ 526,500

$ 527,100

$ 606,100

[1]	As of March 31, 2016 and December 31, 2015, there were fifteen available credit facilities
[2]	As of December 31, 2015 and December 31, 2014 the stated portion of allowable credit facilities permitted to be utilized for revolving loans was $1.4 billion and $1.6 billion, respectively. However, as of December 31, 2015 and December 31, 2014, $527.1 million and $606.1 million, respectively, of such facilities' limits were utilized to issue letters of credit, leaving $822.9 million and $968.9 million, respectively, available either to issue additional letters of credit or to support other operating or financing needs under these particular facilities.
[3]	As of December 31, 2015 and December 31, 2014, there were fifteen and eight available credit facilities, respectively.
[4]	As of March 31, 2016 and December 31, 2015 the stated portion of allowable credit facilities permitted to be utilized for revolving loans was $1.4 billion. However, as of March 31, 2016 and December 31, 2015, $526.5 million and $527.1 million, respectively, of such facilities' limits were utilized to issue letters of credit, leaving $823.5 million and $822.9 million, respectively, available either to issue additional letters of credit or to support other operating or financing needs under these particular facilities.

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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