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v3.8.0.1

Consolidated Balance Sheets - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 266,592 | $ 356,647
Accounts receivable: |  |
Trade, net of allowance for uncollectible accounts of $2,752 and $1,778, respectively | 113,336 | 101,825
Unbilled revenue and other | 29,947 | 10,328
Current deferred tax assets | 0 | 16,594
Other current assets | 41,768 | 37,388
Total current assets | 451,643 | 522,782
Property and equipment | 2,695,772 | 2,450,890
Less accumulated depreciation | (889,783) | (799,280)
Property and equipment, net | 1,805,989 | 1,651,610
Other assets, net | 105,205 | 72,549
Total assets | 2,362,837 | 2,246,941
Current liabilities: |  |
Accounts payable | 81,299 | 60,210
Accrued liabilities | 71,680 | 58,614
Income tax payable | 2,799 | 0
Current maturities of long-term debt | 109,861 | 67,571
Total current liabilities | 265,639 | 186,395
Long-term debt | 385,766 | 558,396
Deferred tax liabilities | 103,349 | 167,351
Other non-current liabilities | 40,690 | 52,985
Total liabilities | 795,444 | 965,127
Shareholders’ equity: |  |
Common stock, no par, 240,000 shares authorized, 147,740 and 120,630 shares issued, respectively | 1,284,274 | 1,055,934
Retained earnings | 352,906 | 322,854
Accumulated other comprehensive loss | (69,787) | (96,974)
Total shareholders’ equity | 1,567,393 | 1,281,814
Total liabilities and shareholders’ equity | $ 2,362,837 | $ 2,246,941

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- Definition Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(c)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -SubTopic 310 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68054760&loc=d3e55302-109406 + Details
Name: | us-gaap_UnbilledContractsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant