CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 62,206	$ 61,101
Common stock, par value
Common stock, shares authorized	180,000,000	180,000,000
Common stock, issued	92,313,182	92,302,299
Common stock, outstanding	92,292,913	92,285,408
Treasury stock, shares	20,269	16,891