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Debt and Credit Agreements - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 15, 2019 | Jan. 05, 2016 | Nov. 30, 2019 | Dec. 31, 2017 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 26, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issuance costs incurred and capitalized |  |  |  |  | $ 0 |  |
Amortization of debt issuance costs |  |  |  |  | 241,000 | $ 573,000 |
Interest expense |  |  |  |  | $ 200,000 | $ 1,300,000 |
Wells Fargo Bank |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issuance costs incurred and capitalized |  |  |  | $ 2,100,000 |  |  |
Letter of Credit | Wells Fargo Bank |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 10,000,000.0 |  |  |  |  |
Swing Line Loan | Wells Fargo Bank |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | 10,000,000.0 |  |  |  |  |
Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issuance costs incurred and capitalized |  |  | $ 2,300,000 |  |  |  |
Line of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Commitment fee rate on undrawn commitments | 0.15% |  |  |  |  |  |
Line of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Commitment fee rate on undrawn commitments | 0.30% |  |  |  |  |  |
Line of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Spread on variable interest rate | 1.00% |  |  |  |  |  |
Line of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank | LIBOR | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Spread on variable interest rate | 1.25% |  |  |  |  |  |
Line of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank | LIBOR | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Spread on variable interest rate | 2.00% |  |  |  |  |  |
Line of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank | Federal Funds |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Spread on variable interest rate | 0.50% |  |  |  |  |  |
Line of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank | LIBOR Plus 1.00% | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Spread on variable interest rate | 0.25% |  |  |  |  |  |
Line of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank | LIBOR Plus 1.00% | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Spread on variable interest rate | 1.00% |  |  |  |  |  |
Line of Credit | Secured Credit Facility | Wells Fargo Bank |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 400,000,000.0 |  |  |  |  |
Line of Credit | Secured Credit Facility | Wells Fargo Bank | LIBOR | Interest Rate Option One | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Spread on variable interest rate |  | 1.50% |  |  |  |  |
Line of Credit | Secured Credit Facility | Wells Fargo Bank | LIBOR | Interest Rate Option One | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Spread on variable interest rate |  | 2.25% |  |  |  |  |
Line of Credit | Secured Credit Facility | Wells Fargo Bank | LIBOR | Interest Rate Option Two | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Spread on variable interest rate |  | 0.50% |  |  |  |  |
Line of Credit | Secured Credit Facility | Wells Fargo Bank | LIBOR | Interest Rate Option Two | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Spread on variable interest rate |  | 1.25% |  |  |  |  |
Line of Credit | Secured Credit Facility | Wells Fargo Bank | Federal Funds | Interest Rate Option Two |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Spread on variable interest rate |  | 0.50% |  |  |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Balance transfer | $ 80,000,000.0 |  |  |  |  |  |
Line of Credit | Revolving Credit Facility | Wells Fargo Bank |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 200,000,000.0 |  |  |  |  | $ 315,000,000.0
Term of debt instrument |  | 5 years |  |  |  |  |
Line of Credit | Revolving Credit Facility | Wells Fargo Bank | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Commitment fee rate on undrawn commitments |  | 0.20% |  |  |  |  |
Line of Credit | Revolving Credit Facility | Wells Fargo Bank | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Commitment fee rate on undrawn commitments |  | 0.35% |  |  |  |  |
Line of Credit | Revolving Credit Facility | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 500,000,000.0 |  |  |  |  |  |
Term of debt instrument | 5 years |  |  |  |  |  |
Line of Credit | Term Loan Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Balance transfer | $ (80,000,000.0) |  |  |  |  |  |
Line of Credit | Term Loan Facility | Wells Fargo Bank |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 200,000,000.0 |  |  |  |  |
Term of debt instrument |  | 5 years |  |  |  |  |
Line of Credit | Letter of Credit | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 15,000,000.0 |  |  |  |  |  |
Line of Credit | Swing Line Loan | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 25,000,000.0 |  |  |  |  |  |
Line of Credit | Incremental Loan Facility | Wells Fargo Securities, Citizens Bank and JP Morgan Chase Bank |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 250,000,000.0 |  |  |  |  |  |

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