Shareholders' Equity (Details)	9 Months Ended
	Sep. 30, 2015 $ / shares $ / unit shares
Class of Warrant or Right [Line Items]
Common stock, beneficial ownership threshold to be considered an Acquiring Person (in hundredths)	5.00%
Shareholder rights accompanying each outstanding share of the company's common stock (in number of Rights)	1
Purchase price (in dollars per share) | $ / shares	$ 45
Purchase price (in dollars per one-tenth share) | $ / shares	$ 4.50
Redemption price (in dollars per Right) | $ / unit	0.001
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 shares purchasable per Right (in shares)	0.1
Rights
Class of Warrant or Right [Line Items]
Number of rights per outstanding share of common stock	1
Period after public announcement that a person has become an acquirer	10 days
Period after a person announces a tender offer which would make them an acquirer	10 days