Shareholders' Equity (Details) (USD $)	3 Months Ended
	Mar. 31, 2015 Right
Shareholder Rights Agreement [Abstract]
Shareholder rights accompanying each outstanding share of the company's common stock (in number of Rights)	1
Distribution date, description	The earlier of ten days after a public announcement that a person has become an Acquiring Person, or ten business days after a person announces or begins a tender offer in which consummation of such offer would result in a person becoming an Acquiring Person
Common stock, beneficial ownership threshold to be considered an Acquiring Person (in hundredths)	5.00%
Common shares purchasable per Right (in shares)	0.10
Purchase price (in dollars per share)	$ 14
Purchase price (in dollars per one-tenth share)	$ 1.40
Redemption price (in dollars per Right)	$ 0.001