Fair Values of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Estimated Fair Value of Outstanding Debt Balances

The estimated fair value of the Company’s outstanding debt balances as of June 30, 2017 and December 31, 2016 is set forth below (in thousands):

	June 30, 2017				December 31, 2016
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value
4.97% Series A Senior Notes	$	300,000	$	303,396	$	300,000	$	283,534
4.27% Series B Senior Notes		300,000		292,033		300,000		263,194
Total debt	$	600,000	$	595,429	$	600,000	$	546,728