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Debt (Narrative) (Details) - USD ($) | 1 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2019 | Feb. 28, 2019 | Mar. 31, 2019 | Mar. 22, 2019 | Jan. 21, 2019 | Aug. 31, 2018 | Nov. 15, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit |  | $ 60,000,000 |  |  |  |  |
Current debt |  | 25,948,000 |  |  |  | $ 23,600,000 |
Repayments Of Long Term Debt |  | 400,000 |  |  |  |  |
Series A Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayment of principal |  | $ 400,000 |  |  |  |  |
Sixth Amended Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Revolving credit facility, amount |  |  |  |  | $ 175,000,000 |  |
Revolving credit facility, expiration date |  | May 13, 2020 |  |  |  |  |
Seventh Amended Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Share buy-back plan, amount authorized |  | $ 150,000,000 |  |  |  |  |
Revolving credit facility, expiration date |  | Jan. 22, 2024 |  |  |  |  |
Consolidated leverage ratio |  | 3 |  |  |  |  |
Consolidated interest coverage ratio |  | 3 |  |  |  |  |
Autoborrow Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Current debt |  | $ 10,100,000 |  |  |  |  |
Line of credit, short-term liability |  | 30,000,000 |  |  |  |  |
Line Of Credit [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit |  | 15,000,000 |  |  |  |  |
Revolving credit facility, additional borrowed amount |  | 15,000,000 |  |  |  |  |
Repayment of short-term debt |  | 20,000,000 |  |  |  |  |
Line Of Credit [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit |  | $ 45,000,000 |  |  |  |  |
Repayments Of Long Term Debt | $ 44,000,000 |  |  |  |  |  |
Note Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal payment frequency of periodic payment |  | semi-annually |  |  |  |  |
Note Agreement [Member] | Series A Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 20,000,000
Interest rate |  | 3.39% |  |  |  |  |
Maturity date |  | Nov. 15, 2032 |  |  |  |  |
Date of first payment required |  | May 15, 2018 |  |  |  |  |
Periodic payment amount |  | $ 400,000 |  |  |  |  |
Date of final semi-annual payment required |  | May 15, 2032 |  |  |  |  |
Balloon payment |  | $ 8,400,000 |  |  |  |  |
Shelf Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  | $ 0 |  |  |  |  |
Latest date to issue senior notes |  | Nov. 15, 2020 |  |  |  |  |
Period of debt issuance and maturity |  | 15 years 6 months |  |  |  |  |
Maximum [Member] | Shelf Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Additional maximum borrowing capacity |  | $ 105,000,000 |  |  |  |  |
Subsequent Events [Member] | Seventh Amended Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Revolving credit facility, amount |  |  | $ 100,000,000 | $ 125,000,000 |  |  |
Subsequent Events [Member] | United Kingdom Subsidiary [Member] | Seventh Amended Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Revolving credit facility, amount |  |  | $ 50,000,000 |  |  |  |

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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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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