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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities      
Net income $ 1,249 $ 23,170 $ 21,509
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 22,944 18,860 18,971
Write-off and amortization of debt issuance costs 2,542 2,042 2,912
Share-based compensation expense 1,621 1,562 1,473
Loss on disposal of property and equipment 17 47 18
Change in fair value of business combination liability   (5,642) (5,932)
Gain on extinguishment of convertible senior notes (98)    
Income from joint ventures   (1,017) (314)
Deferred income taxes (259) (329) (371)
Changes in operating assets and liabilities, net of acquisitions      
Accounts receivable (10,212) 71,129 (133,293)
Inventory (14,891) 18,283 (32,043)
Income taxes receivable 22,804    
Prepaid expenses and other assets 15,227 (7,513) 2,534
Accounts payable 10,558 (21,037) 30,391
Accrued expenses (12,767) (26,811) 24,338
Reserve for sales returns and allowances (843) (7,210) (6,897)
Income taxes payable (21,018) (3,014) 2,921
Other liabilities (151) 3,281 (5,147)
Excess tax deficiency from share-based compensation     (85)
Total adjustments 15,474 42,631 (100,524)
Net cash provided by (used in) operating activities 16,723 65,801 (79,015)
Cash flows from investing activities      
Purchases of property and equipment (14,765) (17,840) (10,524)
Distributions from joint venture   60 332
Cash paid for intangible assets (300)    
Sale of marketable securities   220  
Change in other assets   (4,149) (2,766)
Net cash used in investing activities (15,065) (21,709) (12,958)
Cash flows from financing activities      
Surrender of common stock (1,462) (1) (2)
Repurchase of common stock (13,506) (13,193) (24,000)
Repurchase of common stock for employee tax withholding (1,462) (1) (2)
Net proceeds from credit facility borrowings 10,000    
Credit facility costs   (188) (1,851)
Repurchase of convertible senior notes (8,035)   (39,000)
Proceeds from issuance of convertible senior notes     115,000
Bank fees related to convertible senior notes     (4,594)
Retirement of convertible senior notes (8,035)   (39,000)
Proceeds from issuance of common shares of non-controlling interests 500   490
Excess tax benefit from share-based compensation 548    
Net cash provided by (used in) financing activities (11,955) (13,382) 46,043
Net increase (decrease) in cash and cash equivalents (10,297) 30,710 (45,930)
Effect of foreign currency translation (6,167) 293 384
Cash and cash equivalents, beginning of year 102,528 71,525 117,071
Cash and cash equivalents, end of year 86,064 102,528 71,525
Cash paid during the period for:      
Interest 9,855 10,198 8,964
Income taxes $ 2,165 $ 7,832 $ 945