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Consolidated Statements of CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 21,075 $ 28,356 $ 27,789
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 30,516 29,045 25,756
Gain on insurance recovery (2,848) (3,338) 0
Proceeds from insurance recovery received for business interruption and destroyed inventory 2,867 2,599 0
Stock-based compensation expense 3,818 3,872 4,033
Excess tax benefit from stock-based plans 0 (80) (397)
Deferred income taxes 5,559 (1,120) (3,019)
Provision for doubtful accounts 224 383 314
Other 82 (400) (160)
Changes in operating assets and liabilities:      
Accounts receivable 1,820 1,514 960
Inventories (2,112) 6,876 (2,305)
Customer deposits 2,890 3,887 (2,650)
Other assets and liabilities (932) (9,508) (590)
Accounts payable and accrued liabilities (10,502) (2,032) 2,501
NET CASH PROVIDED BY OPERATING ACTIVITIES 52,457 60,054 52,232
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (24,465) (29,838) (27,143)
Maturities of investments 0 12,725 7,250
Purchase of commercial paper and certificates of deposit 0 0 (9,975)
Proceeds from insurance for destroyed property and equipment 1,987 3,011 0
Other investing activities 870 915 1,513
NET CASH USED IN INVESTING ACTIVITIES (21,608) (13,187) (28,355)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from borrowings under revolving credit facilities 0 0 0
Payments of borrowings under revolving credit facilities 0 0 0
Net change in borrowings under revolving credit facilities 0 0 0
Construction allowance receipts 1,590 1,574 6,701
Payments on lease obligations (3,482) (3,125) (2,534)
Excess tax benefit from stock-based plans 0 80 397
Dividends paid (11,392) (30,409) (8,060)
Common stock repurchased 0 (21,282) (14,002)
Taxes on vested restricted shares (1,555) (883) (1,201)
NET CASH USED IN FINANCING ACTIVITIES (14,839) (54,045) (18,699)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 16,010 (7,178) 5,178
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR 63,481 70,659 65,481
CASH AND CASH EQUIVALENTS AT END OF YEAR $ 79,491 $ 63,481 $ 70,659