XML 82 R68.htm IDEA: XBRL DOCUMENT v3.8.0.1
Long-Term Debt - Components of Long-Term Debt (Details) - USD ($)
Dec. 31, 2017
Apr. 28, 2017
Dec. 31, 2016
Components of Long-term debt      
Long-term debt $ 701,906,000   $ 395,833,000
Less: Debt issuance costs (8,631,000)   (2,648,000)
Current portion of long-term debt (5,656,000)   (6,571,000)
Long-term debt (less current portion) 687,619,000   386,614,000
Fair value of long-term debt [1] 703,572,000   395,514,000
Variable rate credit facility      
Components of Long-term debt      
Long-term debt 0   0
Term loan      
Components of Long-term debt      
Long-term debt 299,250,000   390,521,000
Senior unsecured notes      
Components of Long-term debt      
Long-term debt 400,000,000   0
Unsecured subordinated notes payable      
Components of Long-term debt      
Long-term debt $ 2,656,000   $ 5,312,000
Financing Agreement | Variable rate credit facility      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 100,000,000  
[1] * Fair value of the Senior Notes and the term loan B were estimated based on quoted private market transactions and is classified as Level 1 in the fair value hierarchy. The fair value of the unsecured subordinated notes is determined based on a discounted cash flow analysis using current market interest rates of comparable instruments and is classified as Level 2 in the fair value hierarchy.