Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 167,282	$ 149,696
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred Stock, Par or Stated Value Per Share	$ 1	$ 1
Preferred Stock, Shares Authorized	200,000	200,000
Preferred Stock, Shares Issued	0	0
Common Stock, Par or Stated Value Per Share	$ 1	$ 1
Common Stock, Shares Authorized	50,000,000	50,000,000
Common Stock, Shares, Issued	27,189,922	26,881,257
Treasury Stock, Shares	330,487	277,473