Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 351,148	$ 367,515
Short-term marketable securities (note 5)	131,220	118,970
Accounts receivable, net of allowance of $3,300 and $2,818 at December 31, 2013 and December 31, 2012, respectively (note 2)	97,034	81,459
Receivable from Expedia, net (note 15)	15,828	23,971
Taxes receivable (note 9)	14,291	24,243
Deferred income taxes, net (note 9)	4,550	5,971
Prepaid expenses and other current assets	16,214	10,365
Total current assets	630,285	632,494
Long-term marketable securities (note 5)	188,338	99,248
Property and equipment, net (note 6)	81,528	43,802
Deferred income taxes, net (note 9)	893	502
Other long-term assets	18,144	13,274
Intangible assets, net (note 7)	51,842	38,190
Goodwill (note 7)	501,984	471,684
TOTAL ASSETS	1,473,014	1,299,194
Current liabilities:
Accounts payable	9,869	12,796
Deferred merchant payables (note 2)	29,612	1,303
Deferred revenue	43,970	31,563
Credit facility borrowings (note 8)	28,461	32,145
Borrowings, current (note 8)	40,000	40,000
Taxes payable (note 9)	5,443	14,597
Accrued expenses and other current liabilities (note 10)	85,534	63,236
Total current liabilities	242,889	195,640
Deferred income taxes, net (note 9)	13,114	11,023
Other long-term liabilities (note 11)	52,531	25,563
Borrowings, net of current portion (note 8)	300,000	340,000
Total Liabilities	608,534	572,226
Commitments and Contingencies (note 12)
Stockholders' equity: (note 14)
Preferred stock $0.001 par value Authorized shares: 100,000,000 Shares issued and outstanding: 0 and 0
Common stock	131	130
Additional paid-in capital	608,001	531,256
Retained earnings	401,881	196,438
Accumulated other comprehensive loss	(325)	(869)
Treasury stock-Common stock, at cost, 2,120,709 and 0 shares, at December 31, 2013 and December 31, 2012 respectively	(145,221)
Total stockholders' equity	864,480	726,968
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,473,014	1,299,194
Class B Common Stock [Member]
Stockholders' equity: (note 14)
Common stock	13	13
Total stockholders' equity	$ 13	$ 13