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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net income $ 10,795 $ 11,008
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,476 1,225
Deferred income tax 400 0
Stock-based compensation 613 593
Provision for losses on accounts receivable 50 199
Net foreign currency effect 112 40
Changes in operating assets and liabilities:    
Accounts receivable (2,127) (2,122)
Deposits 20 (364)
Income tax receivable 3,593 1,130
Prepaid expenses and other current assets (1,032) (79)
Accounts payable 845 508
Accrued expenses 1,221 5,302
Deferred revenue (847) (60)
Deferred rent 111 (34)
Income tax payable 1,038 (283)
Other non-current liabilities 210 (224)
Net cash provided by operating activities 16,478 16,839
Cash flows from investing activities:    
Purchases of property and equipment (2,109) (1,272)
Purchases of restricted cash (263) 0
Net cash used in investing activities (2,372) (1,272)
Cash flows from financing activities:    
Net cash used in financing activities 0 0
Effect of exchange rate changes on cash and cash equivalents (1,894) (150)
Net increase in cash and cash equivalents 12,212 15,417
Cash and cash equivalents at beginning of period 61,169 38,744
Cash and cash equivalents at end of period 73,381 54,161
Supplemental disclosure of cash flow information:    
Cash paid for income taxes, net $ 20 $ 5,391