CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current Assets
Investments at fair value	$ 2,907	$ 2,654
Shareholders' Equity
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	96,000,000	96,000,000
Common stock, shares issued (in shares)	48,935,000	48,475,000
Common stock, shares outstanding (in shares)	48,935,000	48,475,000