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Debt - Credit Facilities (Details) - Line of Credit - USD ($) | Dec. 05, 2018 | Dec. 19, 2014 | Dec. 31, 2018
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Fifth Amended and Restated Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Percentage of loan availability from pledged assets from mortgaged assets, maximum | 10.00% |  |
Borrowings outstanding |  |  | $ 0
Letters of credit outstanding |  |  | 66,100,000
Revolving Credit Facility | Fifth Amended and Restated Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit Facility, maximum borrowing capacity | $ 250,000,000 |  |
Current borrowing capacity |  |  | 179,400,000
Letter of credit sublimit | Fifth Amended and Restated Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit Facility, maximum borrowing capacity | 60,000,000 |  |
Letters of credit outstanding |  |  | 40,700,000
Swingline Line of Credit | Fifth Amended and Restated Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit Facility, maximum borrowing capacity | 50,000,000 |  |
Option to increase maximum borrowing capacity | Fifth Amended and Restated Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit Facility, maximum borrowing capacity | $ 100,000,000 |  |
Letter of Credit | Fifth Amended and Restated Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit Facility, maximum borrowing capacity |  |  | $ 66,200,000
LIBOR | Minimum | Fifth Amended and Restated Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate basis | 2.25% |  |
LIBOR | Minimum | Fourth Amended and Restated Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate basis |  | 2.50% |
LIBOR | Maximum | Fifth Amended and Restated Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate basis | 3.25% |  |
LIBOR | Maximum | Fourth Amended and Restated Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate basis |  | 3.50% |
Applicable Margin, Less Than Or Equal To 35% Utilization | Fifth Amended and Restated Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility utilization percentage | 35.00% |  |
Applicable Margin, Less Than Or Equal To 35% Utilization | LIBOR | Fifth Amended and Restated Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate basis | 2.25% |  |
Applicable Margin, Greater Than 35% But Less Than Or Equal To 50% Utilization | Minimum | Fifth Amended and Restated Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility utilization percentage | 35.00% |  |
Applicable Margin, Greater Than 35% But Less Than Or Equal To 50% Utilization | Maximum | Fifth Amended and Restated Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility utilization percentage | 50.00% |  |
Applicable Margin, Greater Than 35% But Less Than Or Equal To 50% Utilization | LIBOR | Fifth Amended and Restated Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate basis | 2.75% |  |
Applicable Margin, Greater Than 50% Utilization | Fifth Amended and Restated Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Facility utilization percentage | 50.00% |  |
Applicable Margin, Greater Than 50% Utilization | LIBOR | Fifth Amended and Restated Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate basis | 3.25% |  |
Unused Commitment Fee, Outstanding Debt Percentage Greater Than Or Equal To 50% | Fifth Amended and Restated Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Quarterly commitment fee | 0.25% |  |
Line of credit percentage outstanding | 50.00% |  |
Unused Commitment Fee, Outstanding Debt Percentage Less Than 50% | Fifth Amended and Restated Credit Agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Quarterly commitment fee | 0.35% |  |
Line of credit percentage outstanding | 50.00% |  |

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- Definition Line Of Credit Facility, Facility Utilization Percentage + References No definition available. + Details
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- Definition Line Of Credit, Percentage Outstanding + References No definition available. + Details
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- Definition Percentage Of Loan Availability From Pledged Assets From Mortgaged Assets, Maximum + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + 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 Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + 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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