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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 10,169 $ 7,944
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization of fixed and intangible assets 9,516 8,094
Amortization of other long term assets 2,313 2,777
Amortization of discounted liabilities 202 13
Stock-based compensation 2,778 2,322
Change in deferred income taxes (26) 7
Loss from equity method investments 518 111
Changes in assets and liabilities associated with operations:    
Decrease in net receivables 5,478 20,749
Increase in inventories (40,194) (5,506)
Increase in prepaid expenses and other assets (707) (2,658)
(Increase) in income tax receivable/payable, net (271) (12,752)
Increase in accounts payable 11,309 579
Decrease in deferred revenue (7,254) (2,126)
Increase in accrued Program costs 15,039 18,819
Decrease in other payables and accrued expenses (5,151) (4,256)
Net cash provided by operating activities 3,719 34,117
Cash flows from investing activities:    
Capital expenditures (3,230) (4,155)
Investment   (950)
Acquisition of other intangible assets and businesses (1,631) (13,400)
Net cash used in investing activities (4,861) (18,505)
Cash flows from financing activities:    
Payments under line of credit agreement (62,125) (59,025)
Borrowings under line of credit agreement 58,800 45,000
Payments on other long-term liabilities   (26)
Net receipts from the issuance of common stock (sale of stock under ESPP, exercise of stock options, and shares purchased for tax withholding) 1,335 (1,214)
Payment of cash dividends (1,024) (724)
Net cash used by financing activities (3,014) (15,989)
Net decrease in cash and cash equivalents (4,156) (377)
Effect of exchange rate changes on cash and cash equivalents (82) 105
Cash and cash equivalents at beginning of period 11,337 7,869
Cash and cash equivalents at end of period $ 7,099 $ 7,597