Leases (Tables)

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Summary of Components of Lease Cost

The components of lease cost are as follows:

	Three Months Ended		Six Months Ended
	June 30, 2019		June 30, 2019
	(Dollars in Thousands)
Operating lease cost	$	19,355	$	39,336
Finance lease cost:
Amortization of right-of-use assets		636		1,570
Interest on lease liabilities		137	285
Variable lease cost		6,099		10,766
Short-term lease cost		8,142		16,260
Total lease cost	$	34,369	$	68,217

Summary of Balance Sheet Classifications of Operating and Finance Leases

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

	June 30, 2019
	(Dollars in Thousands)
Operating Leases:
Operating lease right-of-use assets	$	487,360
Current operating lease liabilities	$	51,011
Noncurrent operating lease liabilities		438,932
Total operating lease liabilities	$	489,943
Finance Leases:
Property, plant and equipment	$	10,829
Accumulated depreciation		(1,570	)
Property, plant and equipment, net	$	9,259
Other current liabilities	$	3,268
Other noncurrent liabilities		7,095
Total finance lease liabilities	$	10,363

Summary of Weighted-average Remaining Lease Terms and Discount Rates

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

	June 30, 2019
Weighted-average remaining lease term (years):
Operating leases		14.9
Finance leases		8.4
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 June 30, 2019 are as follows:

	Operating			Finance
	Leases			Leases
	(Dollars in Thousands)
2019	$	35,493		$	1,906
2020		65,623			3,196
2021		53,662			1,951
2022		49,131			1,094
2023		46,313			779
Thereafter		432,382			4,177
Total lease payments		682,604			13,103
Less: imputed interest		(192,661	)		(2,740	)
Present value of lease payments		489,943			10,363
Less: current lease obligations		(51,011	)		(3,268	)
Total long-term lease obligations	$	438,932		$	7,095

Summary of Other Leases Information

Other lease information is as follows:

	June 30, 2019
	(Dollars in Thousands)
Cash paid for amounts included in the measurement    of lease liabilities:
Operating cash flows used for operating leases	$	38,532
Operating cash flows used for finance leases	$	285
Financing cash flows used for finance leases	$	1,820

	Three Months Ended		Six Months Ended
	June 30, 2019		June 30, 2019
	(Dollars in Thousands)
Right-of-use assets obtained in exchange for new    operating lease liabilities	$	5,803	$	524,689
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