Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Asset and liabilities recorded at fair value

Asset and liabilities recorded at fair value in the accompanying balance sheets as of December 31, 2015 and 2014, respectively, were as follows:

	As of December 31, 2015
	Level 1		Level 2		Total
	(In thousands)
Assets:
Investments	$	—	$	4,235	$	4,235
Demand obligations	—		131		131
Interest rate derivative financial instruments	—		31		31
Total	$	—	$	4,397	$	4,397
Liabilities:
Interest rate derivative financial instruments	$	—	$	31,153	$	31,153
Total	$	—	$	31,153	$	31,153

	As of December 31, 2014
	Level 1		Level 2		Total
	(In thousands)
Assets:
Investments	$	—	$	12,283	$	12,283
Demand obligations	$	—	$	20,304	$	20,304
Total	$	—	$	32,587	$	32,587
Liabilities:
Interest rate derivative financial instruments	$	—	$	28,653	$	28,653
Total	$	—	$	28,653	$	28,653