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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net income $ 732 $ 12,955
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 32,484 17,091
Amortization of debt issuance costs 1,986 1,146
Joint venture net income in excess of cash received (2,743) (1,882)
Compensation expense from issuance of restricted stock and incentive stock options 2,485 1,771
Deferred income tax expense (benefit) 2,235  
Non-cash restructuring and impairment charges 1,891  
Changes in operating assets and liabilities:    
Accounts receivable (24,048) (17,393)
Inventories 1,713 1,305
Accounts payable (3,239) (6,317)
Other assets and liabilities (1,872) (4,399)
Net cash provided by operating activities 11,624 4,277
Cash flows from investing activities:    
Acquisition of property, plant and equipment (18,223) (16,166)
Proceeds from measurement period adjustments to previous acquisition 1,635  
Proceeds from disposals of property, plant and equipment 215 433
Cash paid to acquire businesses, net of cash received   (8,966)
Capital contributions to joint venture   (1,372)
Net cash used by investing activities (16,373) (26,071)
Cash flows from financing activities:    
Debt issue costs paid   (136)
Dividends Paid (3,773) (2,676)
Proceeds from long-term debt 11,000 8,517
Repayment of long-term debt (5,875)  
Proceeds of short-term debt, net 6,580 1,453
Proceeds from issuance of stock and exercise of stock options 1,525 1,831
Principal payments on capital lease (2,462) (2,618)
Net cash provided by financing activities 6,995 6,371
Effect of exchange rate changes on cash flows (2,253) (485)
Net change in cash and cash equivalents (7) (15,908)
Cash and cash equivalents at beginning of year 15,087 37,317
Cash and cash equivalents at end of year $ 15,080 $ 21,409