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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income $ 32,158 $ 42,131 $ 20,212
Adjustments to reconcile net income to net cash provided from operating activities:      
Depreciation, depletion, and amortization 37,817 42,721 41,649
Amortization of deferred financing costs in interest expense 654 795 679
Stock-based compensation expense (non-cash) 5,491 4,815 4,964
Deferred tax (benefit) expense 4,368 (5,274) (2,170)
Changes in assets and liabilities net of acquired assets and liabilities:      
Decrease (increase) in accounts receivable 14,777 (2,066) 12,116
Decrease (increase) in inventory 19,372 (30,412) (8,241)
Decrease (increase) in prepaid and other current assets 2,139 (191) 6,647
Increase (decrease) in accounts payable and accrued expenses (17,989) 6,164 (7,739)
Increase (decrease) in unearned revenue (1,184) 4,401 (1,064)
Increase (decrease) in interest and taxes payable (910) 1,161 2,391
Increase (decrease) in long-term liabilities (8,923) (7,348) 6,879
Other — net 2,458 3,384 (401)
Net cash provided from operating activities 90,228 60,281 75,922
Cash flows from investing activities:      
Payments for purchase of property, plant, and equipment (29,505) (29,312) (27,848)
Payments for mine development (22,585) (1,247) (4,776)
Proceeds from sale of property, plant, and equipment 58 3,090 22
Other investments — net 0 (2) 15
Net cash (used in) investing activities (52,032) (27,471) (32,587)
Cash flows from financing activities:      
Proceeds from issuance (repayment) of short-term debt (653) (6,291) (13,692)
Proceeds from issuance of long-term debt 78,000 33,332 70,423
Repayment of long-term debt (88,000) (38,945) (86,036)
Principal payments under capital lease obligations (759) (666) (657)
Cash dividends paid (7,132) (6,865) (6,497)
Deferred financing costs (838) 0 (1,587)
Repurchase of common stock (7,129) (22,282) 0
Issuance of common stock under stock option plans 0 359 1,163
Tax benefit from stock compensation realization 416 477 711
Net cash (used in) financing activities (26,095) (40,881) (36,172)
Effects of exchange rate changes (1,015) (1,553) (445)
Net change in cash and cash equivalents 11,086 (9,624) 6,718
Cash and cash equivalents at beginning of period 13,150 22,774 16,056
Cash and cash equivalents at end of period $ 24,236 $ 13,150 $ 22,774