CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 260,050	$ 287,790
Accounts receivable, net of allowance for doubtful accounts of $1,902 and $1,707, respectively	29,761	33,089
Prepaid expenses and other current assets	22,158	18,762
Total current assets	311,969	339,641
Property and equipment, net	343,429	360,761
Deferred tax assets - noncurrent	48,085	48,963
Deposits and other assets - $380 and $389 restricted, respectively	10,563	12,410
Total assets	714,046	761,775
Current liabilities:
Accounts payable	16,752	13,287
Accrued and other current liabilities	38,214	32,151
Current maturities, capital lease obligations	13,286	14,594
Total current liabilities	68,252	60,032
Senior secured notes including premium of $4,230		244,230
Senior secured notes	250,000
Senior unsecured notes	200,000	200,000
Capital lease obligations, net of current maturities	118,684	151,944
Other long term liabilities	22,858	21,775
Total liabilities	659,794	677,981
Commitments and contingencies:
Stockholders' equity:
Common stock, $0.001 par value; 75,000,000 shares authorized; 46,194,626 and 46,398,729 shares issued and outstanding, respectively	46	46
Additional paid-in capital	456,016	460,576
Accumulated other comprehensive income-foreign currency translation	(13,858)	(6,462)
Accumulated deficit	(387,952)	(370,366)
Total stockholders' equity	54,252	83,794
Total liabilities and stockholders' equity	$ 714,046	$ 761,775