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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2016
Fair Value Disclosures [Abstract]  
Financial Instruments Measured at Fair Value

Financial instruments, measured at fair value, by level within the fair value hierarchy were as follows:

 

 

 

Carrying

 

 

Fair Value

 

(In thousands)

 

Value

 

 

Level 1

 

 

Level 2

 

 

Level 3

 

December 31, 2016

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Long-term debt

 

$

717,466

 

 

$

 

 

$

758,415

 

 

$

 

December 31, 2015

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Long-term debt

 

$

624,889

 

 

$

 

 

$

657,270

 

 

$