Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

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, 2017 and 2016, respectively, were as follows:

	As of December 31,
	2017		2016
	(In thousands)
Assets:
Investments	$	844	$	3,254
Demand obligations	13		12
Interest rate derivative financial instruments	9,501		9,484
Total	$	10,358	$	12,750
Liabilities:
Interest rate derivative financial instruments	$	10,579	$	24,411
Total	$	10,579	$	24,411