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Term Loan (Narrative) (Details) - USD ($) | Aug. 10, 2016 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 10, 2016 | Sep. 09, 2016
--- | --- | --- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |  |  |
Restricted cash |  | $ 32,231,000 | $ 186,216,000 |  |
Line of Credit [Member] | Term Loan Facility Maturing March 31, 2017 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity | $ 150,000,000 |  |  |  |
Restricted cash | $ 150,000,000 |  |  |  |
Percent increase In restricted cash based on non-u.s. dollar based deposits | 5.00% |  |  |  |
Percent of pledged membership interests | 65.00% |  |  |  |
Line of Credit [Member] | Term Loan Facility Maturing March 31, 2017 [Member] | LIBOR [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Percentage added to basis to find interest rate | 2.00% |  |  |  |
Line of Credit [Member] | Term Loan Facility Maturing March 31, 2017 [Member] | Bank of America, N.A. [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Restricted cash |  |  |  | $ 75,000,000 | $ 50,000,000
Period to increase bank deposits | 30 days |  |  |  |

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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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