Financial Instruments (Contractual Maturities) (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financial Instruments Contractual Maturities Details 3
Due within one year, amortized cost	$ 103,280	$ 65,637
Due after one year through five years, amortized cost	26,005	17,629
Due after five years through ten years, amortized cost	0	0
Due after ten years, amortized cost	0	0
Due within one year, fair value	103,266	65,632
Due after one year through five years, fair value	26,004	17,612
Due after five years through ten years, fair value	0
Due after ten years, fair value	0
Total debt securities, amortized cost	129,285	83,266
Total debt securities, fair value	$ 129,270	$ 83,244