Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 208,431	$ 279,459
Restricted cash	54,130	0
Accounts receivable:
Trade, net of allowance for uncollectible accounts of $0	75,646	67,932
Unbilled and other	49,811	51,943
Other current assets	50,450	51,594
Total current assets	438,468	450,928
Property and equipment	2,922,274	2,785,778
Less accumulated depreciation	(1,049,637)	(959,033)
Property and equipment, net	1,872,637	1,826,745
Operating lease right-of-use assets	201,118	0
Other assets, net	84,508	70,057
Total assets	2,596,731	2,347,730
Current liabilities:
Accounts payable	69,055	54,813
Accrued liabilities	62,389	85,594
Income tax payable	0	3,829
Current maturities of long-term debt	99,731	47,252
Current operating lease liabilities	53,785	0
Total current liabilities	284,960	191,488
Long-term debt	306,122	393,063
Operating lease liabilities	151,827	0
Deferred tax liabilities	112,132	105,862
Other non-current liabilities	38,644	39,538
Total liabilities	893,685	729,951
Redeemable noncontrolling interests	3,455	0
Shareholders’ equity:
Common stock, no par, 240,000 shares authorized, 148,888 and 148,203 shares issued, respectively	1,318,961	1,308,709
Retained earnings	445,370	383,034
Accumulated other comprehensive loss	(64,740)	(73,964)
Total shareholders’ equity	1,699,591	1,617,779
Total liabilities, redeemable noncontrolling interests and shareholders’ equity	$ 2,596,731	$ 2,347,730