CONSOLIDATED BALANCE SHEETS [Parenthetical] - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Allowance for Doubtful Accounts Receivable, Current	$ 346	$ 376
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	189,449	181,575
Finite-Lived Intangible Assets, Accumulated Amortization	$ 4,009	$ 3,798
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	4,000,000	4,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares, Issued	18,878,060	19,969,347
Common Stock, Shares, Outstanding	18,878,060	19,969,347