Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 356,889	$ 356,647
Accounts receivable:
Trade, net of allowance for uncollectible accounts of $2,752 and $1,778, respectively	90,480	101,825
Unbilled revenue and other	45,816	10,328
Current deferred tax assets	0	16,594
Other current assets	38,172	37,388
Total current assets	531,357	522,782
Property and equipment	2,612,407	2,450,890
Less accumulated depreciation	(878,248)	(799,280)
Property and equipment, net	1,734,159	1,651,610
Other assets, net	100,974	72,549
Total assets	2,366,490	2,246,941
Current liabilities:
Accounts payable	91,412	60,210
Accrued liabilities	60,761	58,614
Income tax payable	1,756	0
Current maturities of long-term debt	108,611	67,571
Total current liabilities	262,540	186,395
Long-term debt	395,345	558,396
Deferred tax liabilities	154,158	167,351
Other non-current liabilities	42,736	52,985
Total liabilities	854,779	965,127
Commitments and contingencies
Shareholders’ equity:
Common stock, no par, 240,000 shares authorized, 147,713 and 120,630 shares issued, respectively	1,281,747	1,055,934
Retained earnings	302,326	322,854
Accumulated other comprehensive loss	(72,362)	(96,974)
Total shareholders’ equity	1,511,711	1,281,814
Total liabilities and shareholders’ equity	$ 2,366,490	$ 2,246,941