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Long-Term Debt Long-Term Debt (Tables)
9 Months Ended
Sep. 30, 2017
Debt Disclosure [Abstract]  
Long-term debt
Long-term debt consists of the following (in thousands):
 
September 30,
 
December 31,
 
2017
 
2016
Unsecured notes
$
425,000

 
$
425,000

Credit Agreement

 
97,500

Unamortized discounts and issuance costs of unsecured notes
(4,631
)
 
(5,579
)
 
$
420,369

 
$
516,921

Current portion, long-term debt
$

 
$
15,000

Long-term debt
$
420,369

 
$
501,921