CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 234,960	$ 247,285
Accounts receivable, net of allowance for doubtful accounts of $1,759 and $3,083, respectively	26,831	23,990
Prepaid expenses and other current assets	12,411	9,978
Total current assets	274,202	281,253
Property and equipment, net	328,080	311,175
Deposits and other assets - $438 and $442 restricted, respectively	13,955	14,103
Total assets	616,237	606,531
Current liabilities:
Accounts payable	16,665	14,734
Accrued liabilities	24,346	26,519
Current maturities, capital lease obligations	6,701	10,487
Total current liabilities	47,712	51,740
Senior secured notes	175,000	175,000
Capital lease obligations, net of current maturities	143,195	127,461
Convertible senior notes, net of discount of $7,947 and $9,494 respectively	84,031	82,484
Other long term liabilities	10,438	10,067
Total liabilities	460,376	446,752
Commitments and contingencies:
Stockholders' equity:
Common stock, $0.001 par value; 75,000,000 shares authorized; 47,173,444 and 47,116,644 shares issued and outstanding, respectively	47	47
Additional paid-in capital	500,352	497,349
Accumulated other comprehensive income - foreign currency translation	(1,126)	667
Accumulated deficit	(343,412)	(338,284)
Total stockholders' equity	155,861	159,779
Total liabilities and stockholders' equity	$ 616,237	$ 606,531