Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 478,200	$ 437,100
Accounts receivable - Trade, net of allowance for uncollectible accounts of $2,234 and $5,152, respectively	156,925	152,233
Unbilled revenue	25,732	26,992
Costs in excess of billing	1,508	6,848
Current deferred tax assets	51,573	43,942
Other current assets	29,709	52,992
Current assets of discontinued operations		84,000
Total current assets	743,647	804,107
Property and equipment	1,959,783	2,051,796
Less accumulated depreciation	(431,489)	(565,921)
Property and equipment, net	1,528,294	1,485,875
Other assets:
Equity investments	157,919	167,599
Goodwill	63,230	62,935
Other assets, net	51,190	49,837
Non-current assets of discontinued operations		816,227
Total assets	2,544,280	3,386,580
Current liabilities:
Accounts payable	72,602	92,398
Accrued liabilities	96,482	161,514
Income tax payable	760
Current maturities of long-term debt	20,376	16,607
Current liabilities of discontinued operations		182,527
Total current liabilities	190,220	453,046
Long-term debt	545,776	1,002,621
Deferred tax liabilities	265,879	359,237
Other non-current liabilities	18,295	5,025
Non-current liabilities of discontinued operations		147,237
Total liabilities	1,020,170	1,967,166
Commitments and contingencies
Shareholders' equity:
Common stock, no par, 240,000 shares authorized, 105,640 and 105,763 shares issued, respectively	933,507	932,742
Retained earnings	586,232	476,310
Accumulated other comprehensive loss	(20,688)	(15,667)
Total controlling interest shareholders' equity	1,499,051	1,393,385
Noncontrolling interests	25,059	26,029
Total equity	1,524,110	1,419,414
Total liabilities and shareholders' equity	$ 2,544,280	$ 3,386,580