Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Schedule of Financial Assets at Fair Value Recurring Basis and Fair Value Hierarchy

Information about the Company’s financial assets and liabilities measured at fair value on a recurring basis, aggregated by the level in the fair value hierarchy within which those measurements fall, is presented below (amounts in thousands):

			Fair Value Measurement at Reporting Date Using
	Balance at December 31, 2016		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Available-for-sale securities	$	248	$	248	$	—	$	—
Interest rate swaps	$	10,680	$	—	$	10,680	$	—
Liabilities
Interest rate swaps	$	8	$	—	$	8	$	—

			Fair Value Measurement at Reporting Date Using
	Balance at December 31, 2015		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Available-for-sale securities	$	85	$	85	$	—	$	—
Liabilities
Interest rate swaps	$	8,334	$	—	$	8,334	$	—

Schedule of Long-Term Debt, Carrying Values and Estimated Fair Values

The estimated fair value of the Company’s long-term debt compared with its carrying amount is presented below (amounts in millions):

	December 31,
	2016		2015
Aggregate fair value	$	2,521	$	2,177
Aggregate carrying amount	$	2,422	$	2,155