Leases (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Summary of Components of Lease Cost

The components of lease cost are as follows:

	Three Months Ended
	March 31, 2019
	(Dollars in Thousands)
Operating lease cost	$	19,966
Finance lease cost:
Amortization of right-of-use assets		935
Interest on lease liabilities		148
Variable lease cost		4,667
Short-term lease cost		8,118
Total lease cost	$	33,834

Summary of Balance Sheet Classifications of Operating and Finance Leases

The balance sheet classifications of operating and finance leases are as follows:

	Three Months Ended
	March 31, 2019
	(Dollars in Thousands)
Operating Leases:
Operating lease right-of-use assets	$	498,233
Current operating lease liabilities	$	50,776
Noncurrent operating lease liabilities		446,128
Total operating lease liabilities	$	496,904
Finance Leases:
Property, plant and equipment	$	11,143
Accumulated depreciation		(935	)
Property, plant and equipment, net	$	10,208
Other current liabilities	$	3,456
Other noncurrent liabilities		7,862
Total finance lease liabilities	$	11,318

Summary of Weighted-average Remaining Lease Terms and Discount Rates

Weighted-average remaining lease terms and discount rates are as follows:

	March 31, 2019
Weighted-average remaining lease term (years):
Operating leases		15.0
Finance leases		8.2
Weighted-average discount rate:
Operating leases		4.3	%
Finance leases		5.1	%

Summary of Future Lease Payments under Noncancellable Leases

Future lease payments under leases as of March 31, 2019 are as follows:

	Operating			Finance
	Leases			Leases
	(Dollars in Thousands)
2019	$	53,014		$	2,956
2020		63,870			3,243
2021		52,674			1,951
2022		48,376			1,094
2023		45,912			779
Thereafter		429,013			4,176
Total lease payments		692,859			14,199
Less: imputed interest		(195,593	)		(2,881	)
Present value of lease payments		497,266			11,318
Less: current lease obligations		(50,776	)		(3,456	)
Total long-term lease obligations	$	446,490		$	7,862

Summary of Other Leases Information

	Three Months Ended
	March 31, 2019
	(Dollars in Thousands)
Cash paid for amounts included in the measurement    of lease liabilities:
Operating cash flows used for operating leases	$	19,512
Operating cash flows used for finance leases	$	148
Financing cash flows used for finance leases	$	951
Right-of-use assets obtained in exchange for new    operating lease liabilities	$	16,924
Right-of-use assets obtained in exchange for    new finance lease liabilities	$	217

Summary of Future Minimum Lease and Royalty Commitments for all Noncancelable Agreements and Capital Lease Obligations

Future minimum lease and royalty commitments for all noncancelable agreements and capital lease obligations as of December 31, 2018 were as follows:

	Capital Leases			Operating Leases		Royalty Commitments
	(Dollars in Thousands)
2019	$	3,718		$	105,955	$	14,614
2020		2,695			70,478		11,364
2021		1,735			60,382		10,335
2022		1,004			57,531		9,545
2023		713			56,511		8,109
Thereafter		3,893			318,147		65,981
Total		13,758		$	669,004	$	119,948
Less: imputed interest		(2,879	)
Present value of minimum lease payments		10,879
Less: current capital lease obligations		(3,249	)
Long-term capital lease obligations	$	7,630