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Long-Term Debt Long-Term Debt (Tables)
6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Long-term debt
Long-term debt consists of the following (in thousands):
 
June 30,
 
December 31,
 
2018
 
2017
Unsecured notes
$
425,000

 
$
425,000

Unamortized discounts and issuance costs of unsecured notes
(3,684
)
 
(4,316
)
Long-term debt
$
421,316

 
$
420,684