Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 259,733	$ 292,061
Accounts receivable, net of allowance for doubtful accounts and customer credits of $4,236 as of December 31, 2012 and $3,891 as of December 31, 2013	123,898	92,834
Deferred income taxes	12,637	10,320
Prepaid expenses	30,782	25,195
Other current assets	11,918	4,835
Total current assets	438,968	425,245
Property and equipment, net	890,776	724,985
Goodwill	81,084	68,742
Intangible assets, net	23,880	23,802
Other non-current assets	57,089	52,777
Total assets	1,491,797	1,295,551
Current liabilities:
Accounts payable and accrued expenses	122,047	105,174
Accrued compensation and benefits	62,459	48,404
Income and other taxes payable	11,388	21,550
Current portion of deferred revenue	22,868	17,265
Current portion of obligations under capital leases	37,885	61,302
Current portion of debt	1,861	1,744
Total current liabilities	258,508	255,439
Non-current liabilities:
Deferred revenue	3,662	3,695
Obligations under capital leases	25,048	60,335
Debt	124	1,991
Deferred income taxes	69,729	71,081
Deferred rent	43,046	32,293
Other liabilities	36,268	27,070
Total liabilities	436,385	451,904
COMMITMENTS AND CONTINGENCIES
Stockholders' equity:
Common stock, $0.001 par value per share: 300,000,000 shares authorized; 137,797,855 shares issued and outstanding as of December 31, 2012; 141,123,904 shares issued and outstanding as of December 31, 2013	141	138
Additional paid-in capital	636,660	515,188
Accumulated other comprehensive loss	(4,536)	(8,089)
Retained earnings	423,147	336,410
Total stockholders’ equity	1,055,412	843,647
Total liabilities and stockholders' equity	$ 1,491,797	$ 1,295,551