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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2019
Fair Value Disclosures [Abstract]  
Asset and liabilities recorded at fair value
Assets and liabilities recorded at fair value, within Level 2 of the hierarchy framework, in the accompanying balance sheets as of March 31, 2019 and December 31, 2018, respectively, were as follows (in thousands):
 
 
March 31, 2019
 
December 31, 2018
Assets:
 
 
 
 
Investments
 
$
3,232

 
$
2,788

Demand obligations
 
13

 
13

Interest rate derivative financial instruments
 
8,440

 
13,576

Total
 
$
11,685

 
$
16,377

Liabilities:
 
 
 
 
Interest rate derivative financial instruments
 
$
2,684

 
$
1,811

Total
 
$
2,684

 
$
1,811