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Long-term Debt and Credit Agreement - Narrative (Details) |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 21, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Feb. 20, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit, short term |  | $ 9,400,000 |  |  | $ 9,400,000 |  |  |  |
Line of credit, long term |  | 190,600,000 |  |  | 190,600,000 |  |  |  |
Long-term line of credit |  | 200,000,000 |  |  | 200,000,000 |  |  |  |
Proceeds from lines of credit |  |  |  |  | 284,500,000 | $ 308,500,000 |  |  |
Percentage decrease in overall borrowing costs | 0.50% |  |  |  |  |  |  |  |
Line of credit facility, accordion feature, higher borrowing capacity option | $ 175,000,000 |  |  |  |  |  |  |  |
Additional borrowings from line of credit |  | 24,000,000 | $ 15,000,000 | $ 4,000,000 | 43,000,000 |  |  |  |
Repayments of lines of credit |  |  |  |  | 84,500,000 | $ 308,500,000 |  |  |
Letter of credit agreements outstanding |  | 9,400,000 |  |  | 9,400,000 |  |  | $ 0 |
Term Loan [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, aggregate principal amount |  |  |  |  |  |  |  |  | $ 270,000,000
Long-term line of credit |  |  |  |  |  |  | $ 267,000,000 |  |
Amended and Restated Credit Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, covenant, consolidated senior secured leverage ratio, maximum | 1.75 |  |  |  |  |  |  |  |
Debt instrument, covenant, consolidated interest coverage ratio, minimum | 3.00 |  |  |  |  |  |  |  |
Debt instrument, covenant, consolidated leverage ratio, scenario one, maximum | 3.50 |  |  |  |  |  |  |  |
Debt instrument, covenant, consolidated leverage ratio, scenario two, maximum | 3.25 |  |  |  |  |  |  |  |
Debt instrument, covenant, consolidated leverage ratio, scenario three, maximum | 3.00 |  |  |  |  |  |  |  |
Debt instrument, covenant, consolidated leverage ratio, scenario four, maximum | 2.75 |  |  |  |  |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Letter of credit agreements outstanding |  | 6,600,000 |  |  | 6,600,000 |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, aggregate principal amount |  |  |  |  |  |  |  |  | $ 155,000,000
Letter of credit agreements outstanding |  | 1,100,000 |  |  | 1,100,000 |  |  |  |
Bi-lateral Letter of Credit Agreements [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Letter of credit agreements outstanding |  | 5,500,000 |  |  | 5,500,000 |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit, short term |  | 9,400,000 |  |  | 9,400,000 |  |  |  |
Line of credit, long term |  | 190,600,000 |  |  | 190,600,000 |  |  |  |
Long-term line of credit |  | 200,000,000 |  |  | 200,000,000 |  |  |  |
Proceeds from lines of credit | $ 242,000,000 |  |  |  |  |  |  |  |
Debt instrument, term | 5 years |  |  |  |  |  |  |  |
Repayments of lines of credit |  | $ 34,000,000 | $ 35,000,000 | $ 16,000,000 | $ 85,000,000 |  |  |  |
Revolving Credit Facility [Member] | Senior Secured Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 425,000,000 |  |  |  |  |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 40,000,000 |  |  |  |  |  |  |  |
Bridge Loan [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 40,000,000 |  |  |  |  |  |  |  |
Minimum [Member] | Amended and Restated Credit Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commitment fee percentage | 0.20% |  |  |  |  |  |  |  |
Maximum [Member] | Amended and Restated Credit Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Commitment fee percentage | 0.40% |  |  |  |  |  |  |  |
Base Rate [Member] | Amended and Restated Credit Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 0.75% |  |  |  |  |  |  |  |
Base Rate [Member] | Minimum [Member] | Amended and Restated Credit Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 0.50% |  |  |  |  |  |  |  |
Base Rate [Member] | Maximum [Member] | Amended and Restated Credit Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.50% |  |  |  |  |  |  |  |
Eurodollar [Member] | Amended and Restated Credit Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.75% |  |  |  |  |  |  |  |
Commitment fee percentage | 0.25% |  |  |  |  |  |  |  |
Eurodollar [Member] | Minimum [Member] | Amended and Restated Credit Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.50% |  |  |  |  |  |  |  |
Eurodollar [Member] | Maximum [Member] | Amended and Restated Credit Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 2.50% |  |  |  |  |  |  |  |

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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://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 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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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