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Commitments and Contingencies Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Jun. 23, 2015
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Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 500,000
Credit Facility [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | [1] | $ 500,000 |  | $ 500,000 |
Standby Letters of Credit [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 250,000 | $ 300,000 |  |
[1] | Refer to Note 6 for details regarding our secured credit facilities.

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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