Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Table) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Investment Maturity Date Range One Year Or Less [Member]
Investment [Line Items]
Financial Instruments, Owned, Corporate Debt, at Fair Value	$ 4,078	$ 8,285
Certificates of Deposit, at Carrying Value	16,513	8,000
Marketable Securities	20,591	16,285
Investment Maturity Date Range One To Eight Years [Member]
Investment [Line Items]
Financial Instruments, Owned, Corporate Debt, at Fair Value	82,888	73,027
Certificates of Deposit, at Carrying Value	8,379	8,175
Marketable Securities	$ 91,267	$ 81,202

- Definition

A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References+ Details