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Long-Term Indebtedness (Details) |  |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 27, 2016 USD ($) | Mar. 20, 2015 USD ($) | Feb. 24, 2014 USD ($) | Dec. 31, 2017 USD ($) | Feb. 28, 2018 USD ($) | Jan. 31, 2018 USD ($) | Mar. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 03, 2015 USD ($)
Line of Credit Facility |  |  |  |  |  |  |  |  |
Long-term indebtedness |  |  |  | $ 49,924,000 |  |  |  | $ 49,949,000 |
Maximum |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 65.00% |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Amount outstanding |  |  |  | 0 |  |  |  | 0 |
Remaining availability under the facilities |  |  |  | $ 297,600,000 |  |  |  |  |
Maximum leverage ratio |  |  |  | 2.5 |  |  |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Maximum borrowings under line of credit |  |  |  |  |  |  | $ 100,000,000 |  | $ 100,000,000.0
Letter of credit |  |  |  | $ 2,400,000 |  |  |  | $ 2,500,000 |
Remaining availability under the facilities |  |  |  | $ 197,600,000 |  |  |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | Prime Rate |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 1.00% |  |  |  |  |
JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank [Member] | Line of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Maximum borrowings under line of credit | $ 200,000,000.0 |  |  |  |  |  |  |  |
Additional maximum borrowing capacity upon approval | $ 125,000,000.0 |  |  |  |  |  |  |  |
Prudential Investment Management Inc | Line of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Long-term indebtedness |  | $ 50,000,000 |  |  |  |  |  |  |
Weighted average interest rate |  | 3.35% |  |  |  |  |  |  |
Remaining availability under the facilities |  |  | $ 150,000,000.0 |  |  |  |  |  |
Debt instrument term (in years) |  | 5 years |  |  |  |  |  |  |
Period after request is issued, by company, for interest payable rate to be determined by Prudential |  |  | 5 days |  |  |  |  |  |
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank [Member] | Line of Credit | LIBOR | Minimum |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Debt additional margin interest rate | 0.00% |  |  |  |  |  |  |  |
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank [Member] | Line of Credit | LIBOR | Maximum |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Debt additional margin interest rate | 0.625% |  |  |  |  |  |  |  |
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank [Member] | Line of Credit | Federal Funds Effective Rate |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Interest rate | 0.50% |  |  |  |  |  |  |  |
Option Two | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank [Member] | Line of Credit | LIBOR | Maximum |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Interest rate | 1.625% |  |  |  |  |  |  |  |
Subsequent Event | Amended Credit Agreement |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Maximum borrowings under line of credit |  |  |  |  | $ 325,000,000 | $ 200,000,000 |  |  |

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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 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://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 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 + Details
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