Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 200,058	$ 367,515
Short-term marketable securities (note 4)	196,037	118,970
Accounts receivable, net of allowance of $2,918 and $2,818 at June 30, 2013 and December 31, 2012, respectively	137,981	81,459
Receivable from Expedia, Inc., net (note 14)	35,239	23,971
Taxes receivable	18,072	24,243
Deferred income taxes, net	7,026	5,971
Prepaid expenses and other current assets	17,059	10,365
Total current assets	611,472	632,494
Long-term marketable securities (note 4)	219,865	99,248
Property and equipment, net	54,601	43,802
Deferred income taxes, net	1,050	502
Other long-term assets	14,460	13,274
Intangible assets, net (note 7)	52,122	38,190
Goodwill (note 7)	502,015	471,684
TOTAL ASSETS	1,455,585	1,299,194
Current liabilities:
Accounts payable	9,153	12,796
Deferred merchant payables (note 2)	31,251	1,303
Deferred revenue	42,416	31,563
Credit facility borrowings (note 5)	24,633	32,145
Borrowings, current (note 5)	40,000	40,000
Taxes payable	12,006	14,597
Accrued expenses and other current liabilities (note 8)	81,840	63,236
Total current liabilities	241,299	195,640
Deferred income taxes, net	8,064	11,023
Other long-term liabilities	34,263	25,563
Borrowings, net of current portion (note 5)	320,000	340,000
Total Liabilities	603,626	572,226
Commitments and Contingencies (note 9)
Stockholders' equity:
Preferred stock $0.001 par value Authorized shares: 100,000,000 Shares issued and outstanding: 0 and 0
Additional paid-in capital	573,472	531,256
Retained earnings	325,725	196,438
Accumulated other comprehensive loss	(4,975)	(869)
Treasury stock-Common stock, at cost, 675,000 and 0 shares, at June 30, 2013 and December 31, 2012 respectively	(42,407)
Total stockholders' equity	851,959	726,968
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,455,585	1,299,194
Common Stock [Member]
Stockholders' equity:
Common stock	131	130
Class B Common Stock [Member]
Stockholders' equity:
Common stock	13	13
Total stockholders' equity	$ 13	$ 13