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Fair Value Measurements - Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Earn-out obligation - short-term | $ 10,700 | $ 0
Earn-out obligation - long-term | 14,300 | 0
Fair Value, Measurements, Recurring | Level 1 | Other assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Non-COLI assets held in Deferred Supplemental Compensation Plan | 611 | 403
Fair Value, Measurements, Recurring | Level 2 | Accrued expenses/Other current assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swap agreements | 1,699 | 195
Fair Value, Measurements, Recurring | Level 3 | Earn-out obligation |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Earn-out obligation - short-term | 10,700 | 0
Earn-out obligation - long-term | $ 14,300 | $ 0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This element represents the fair value of mutual funds held in DSC plan. + References No definition available. + Details
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