Debt (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Schedule of Components of Debt

Debt consists of the following at:

	December 31,
	2016		2015
	(in thousands)
$400 million senior unsecured notes with an effective interest rate of 6.0% less deferred issuance costs of $4.7 million and $5.4 million at December 31, 2016 and 2015, respectively	$	395,316	$	394,618
$250 million senior unsecured notes with an effective interest rate of 6.19%, less a discount and deferred issuance costs of $1.1 million and $1.4 million at December 31, 2016 and 2015, respectively	248,875		248,568
$450 million senior unsecured credit facility with an effective interest rate of 2.23% and 2.17%, less deferred issuance costs of $2.6 million and $3.0 million at December 31, 2016 and 2015, respectively	182,359		156,025
Fixed rate collateralized mortgage with an effective interest rate of 4.57%, plus a fair value adjustment of $0.7 million and $0.9 million at December 31, 2016 and 2015, respectively	9,432		10,048
Economic development loans with an effective rate interest rate of 3.0% at December 31, 2016 and 2015	3,712		3,712
Capital lease obligations due 2016 with an effective interest rate of 3.18% at December 31, 2016 and 2015	—		430
Other notes payable	910		735
Total debt	840,604		814,136
Less current portion	1,195		1,191
Total long-term debt	$	839,409	$	812,945

Schedule of Maturities of Long-term Debt

Scheduled principal maturities of debt, net of unamortized discounts, premiums and deferred issuance costs, as of December 31, 2016 were as follows:

Year Ending	Senior Notes		Revolving Credit Facility		Other Notes Payable		Total
	(in thousands)
2017	$	—	$	—	$	1,195	$	1,195
2018	—		—		588		588
2019	—		—		497		497
2020	248,875		—		8,062		256,937
2021	—		182,359		—		182,359
Thereafter	395,316		—		3,712		399,028
Total payments	644,191		182,359		14,054		840,604