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v3.19.3.a.u2

Debt (Details Textual) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2020 | Mar. 12, 2019 USD ($) | May 03, 2016 USD ($) | Mar. 23, 2016 USD ($)
Debt [Line Items] |  |  |  |  |  |  |
Interest Expense, Debt | $ 62,210,000 | $ 64,420,000 | $ 62,001,000 |  |  |  |
Amortization of Debt Issuance Costs and Discounts | 3,346,000 | 3,193,000 | $ 3,022,000 |  |  |  |
Amount of letters of credit outstanding | 4,836,000 | 4,701,000 |  |  |  |  |
6.50% Notes due 2024 |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |
Senior Notes | $ 900,000,000 | $ 900,000,000 |  |  |  |  | $ 900,000,000
Wells Fargo Capital Finance, LLC | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 325,000,000 |
Ratio of Indebtedness to Net Capital |  |  |  |  |  | 5.5 |
Senior Notes | 6.50% Notes due 2024 |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage | 6.50% |  |  |  |  |  | 6.50%
Debt Instrument, Percentage Of Redemption Price, Change In Ownership Control | 101.00% |  |  |  |  |  |
Debt Instrument, Percentage Of Redemption Price, Redemption Date, Latest For Redemption At Face Amount | 100.00% |  |  |  |  |  |
Line of Credit [Member] | Amendment, Credit Agreement [Member] |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 250,000,000 |  |  |  | $ 250,000,000 |  |
Ratio of Indebtedness to Net Capital |  |  |  |  | 6.25 |  |
Forecast | Line of Credit [Member] | Amendment, Credit Agreement [Member] |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |
Ratio of Indebtedness to Net Capital |  |  |  | 5.5 |  |  |
Non-Prime Rate and Prime Rate on European Advances [Member] | Wells Fargo Capital Finance, LLC | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  | 0.75% |  |
Base Rate [Member] | Wells Fargo Capital Finance, LLC | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  | 1.50% |  |

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- Definition Amount of amortization expense attributable to debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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