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Debt - Line of Credit (Details) - Fourth Amended and Restated Credit Agreement - Line of Credit - USD ($) | Dec. 19, 2014 | Sep. 30, 2018
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Credit Facilities [Line Items] |  |
Credit facility, maximum borrowing capacity | $ 400,000,000 |
Percentage of loan availability from pledged assets that cannot exceed availability from mortgaged assets | 10.00% |
Line of credit |  | $ 0
Letters of credit issued |  | 66,100,000
Applicable Margin, Less Than Or Equal To 35% Utilization |  |
Credit Facilities [Line Items] |  |
Percentage of utilization | 35.00% |
Applicable Margin, Greater Than 50% Utilization |  |
Credit Facilities [Line Items] |  |
Percentage of utilization | 50.00% |
Unused Commitment Fee, Outstanding Debt Percentage Greater Than Or Equal To 50% |  |
Credit Facilities [Line Items] |  |
Quarterly commitment fee | 0.25% |
Outstanding debt percentage | 50.00% |
Unused Commitment Fee, Outstanding Debt Percentage Less Than 50% |  |
Credit Facilities [Line Items] |  |
Quarterly commitment fee | 0.35% |
Outstanding debt percentage | 50.00% |
Minimum | Applicable Margin, Greater Than 35% But Less Than Or Equal To 50% Utilization |  |
Credit Facilities [Line Items] |  |
Percentage of utilization | 35.00% |
Maximum | Applicable Margin, Greater Than 35% But Less Than Or Equal To 50% Utilization |  |
Credit Facilities [Line Items] |  |
Percentage of utilization | 50.00% |
LIBOR | Applicable Margin, Less Than Or Equal To 35% Utilization |  |
Credit Facilities [Line Items] |  |
Basis spread on variable rate basis | 2.50% |
LIBOR | Applicable Margin, Greater Than 35% But Less Than Or Equal To 50% Utilization |  |
Credit Facilities [Line Items] |  |
Basis spread on variable rate basis | 3.25% |
LIBOR | Applicable Margin, Greater Than 50% Utilization |  |
Credit Facilities [Line Items] |  |
Basis spread on variable rate basis | 3.50% |
LIBOR | Minimum |  |
Credit Facilities [Line Items] |  |
Basis spread on variable rate basis | 2.50% |
LIBOR | Maximum |  |
Credit Facilities [Line Items] |  |
Basis spread on variable rate basis | 3.50% |
Revolving Credit Facility |  |
Credit Facilities [Line Items] |  |
Credit facility, maximum borrowing capacity | $ 400,000,000 |
Letter of credit sublimit |  |
Credit Facilities [Line Items] |  |
Credit facility, maximum borrowing capacity | 50,000,000 |
Letters of credit issued |  | 41,700,000
Swingline Line of Credit |  |
Credit Facilities [Line Items] |  |
Credit facility, maximum borrowing capacity | 50,000,000 |
Option to increase maximum borrowing capacity |  |
Credit Facilities [Line Items] |  |
Credit facility, maximum borrowing capacity | $ 250,000,000 |
Letter of Credit |  |
Credit Facilities [Line Items] |  |
Credit facility, maximum borrowing capacity |  | $ 66,200,000

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- Definition Line Of Credit, Percentage Outstanding + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition The carrying value as of the balance sheet date of the noncurrent portion 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600 + Details
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