Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 252,213	$ 278,823
Short-term investments	166,492	635,721
Accounts receivable, net of allowance for doubtful accounts of $3,716 and $4,635	163,840	139,057
Other current assets	57,206	182,156
Total current assets	639,751	1,235,757
Long-term investments	127,819	161,801
Property, plant and equipment, net	3,918,999	3,225,912
Goodwill	1,042,564	866,495
Intangible assets, net	201,562	148,635
Other assets	202,269	146,724
Total assets	6,132,964	5,785,324
Current liabilities:
Accounts payable and accrued expenses	268,853	229,043
Accrued property, plant and equipment	63,509	93,224
Current portion of capital lease and other financing obligations	15,206	11,542
Current portion of loans payable	52,160	87,440
Current portion of convertible debt		246,315
Other current liabilities	139,561	57,690
Total current liabilities	539,289	725,254
Capital lease and other financing obligations, less current portion	545,853	390,269
Loans payable, less current portion	188,802	168,795
Convertible debt	708,726	694,769
Senior notes	1,500,000	1,500,000
Other liabilities	230,843	286,424
Total liabilities	3,713,513	3,765,511
Redeemable non-controlling interests (Note 10)	84,178	67,601
Commitments and contingencies (Note 14)
Stockholders' equity:
Preferred stock, $0.001 par value per share; 100,000,000 shares authorized in 2012 and 2011; zero shares issued and outstanding in 2012 and 2011
Common stock, $0.001 par value per share; 300,000,000 shares authorized in 2012 and 2011; 49,139,851 issued and 48,776,108 outstanding in 2012 and 47,541,620 issued and 46,671,199 outstanding in 2011	49	48
Additional paid-in capital	2,583,371	2,437,623
Treasury stock, at cost; 363,743 shares in 2012 and 870,421 shares in 2011	(36,676)	(86,666)
Accumulated other comprehensive loss	(101,042)	(143,698)
Accumulated deficit	(110,429)	(255,095)
Total stockholders' equity	2,335,273	1,952,212
Total liabilities, redeemable non-controlling interests and stockholders' equity	$ 6,132,964	$ 5,785,324