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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2016
Fair Value Disclosures [Abstract]  
Asset and liabilities recorded at fair value
Asset and liabilities recorded at fair value, within Level 2 of the hierarchy framework, in the accompanying balance sheets as of December 31, 2016 and 2015, respectively, were as follows:
 
As of December 31,
 
2016
 
2015
 
(In thousands)
Assets:
 
 
 
Investments
$
3,254

 
$
4,235

Demand obligations
12

 
131

Interest rate derivative financial instruments
9,484

 
31

Total
$
12,750

 
$
4,397

Liabilities:
 
 
 
Interest rate derivative financial instruments
$
24,411

 
$
31,153

Total
$
24,411

 
$
31,153