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Debt - Senior Credit Facility (Details) AUD in Millions | Aug. 27, 2014 AUD | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Aug. 27, 2014 USD ($) | Feb. 10, 2011 USD ($)
--- | --- | --- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |  |  |
Term loan |  | $ 291,750,000 | $ 292,500,000 |  |
Revolver |  | $ 514,000,000 | 485,000,000 |  |
Weighted average interest rate |  | 2.90% |  |  |
Term Loan |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Term loan |  | $ 291,800,000 |  |  |
Letter of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-term debt |  | 54,200,000 |  |  |
Additional Revolver |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Borrowing capacity increase |  | 131,800,000 |  |  |
Term Loan | Credit Facility Term Loan |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Face amount |  |  |  | $ 296,300,000 |
Term Loan | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate | 2.50% |  |  |  |
Term Loan | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate | 0.75% |  |  |  |
Revolver |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Revolver |  | 514,000,000 |  |  |
Revolver | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 700,000,000 |
Revolver | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate | 2.25% |  |  |  |
Revolver | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate | 0.00% |  |  |  |
Australian LC Facility | Letter of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity | AUD | AUD 225.0 |  |  |  |
Amount outstanding on letters of credit | AUD | AUD 215.0 |  |  |  |
Credit Agreement |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Total leverage ratio | 5.75 |  |  | 5.75 |
Senior secured leverage ratio | 3.50 |  |  | 3.50 |
Interest coverage ratio | 3.00 |  |  | 3.00 |
6.625% Senior Notes | Senior Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Face amount |  | 300,000,000 |  |  | $ 300,000,000.0
Long-term debt |  | $ 295,013,000 | $ 294,802,000 |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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