Shareholders' Equity (Details)	Jul. 23, 2015 $ / shares shares
Class of Warrant or Right [Line Items]
Common stock, beneficial ownership threshold to be considered an Acquiring Person (as a percent)	5.00%
Common shares purchasable per Right (in shares) | shares	0.1
Shareholder rights accompanying each outstanding share of the company's common stock (in number of Rights) | shares	1
Purchase price (in dollars per share) | $ / shares	$ 45
Purchase price, one-tenth share (in dollars per share) | $ / shares	4.50
Redemption price (in dollars per Right) | $ / shares	$ 0.001
Rights
Class of Warrant or Right [Line Items]
Number of rights per outstanding share of common stock (in shares) | shares	1
Period after public announcement that a person has become an acquirer (in days)	10 days
Period after a person announces a tender offer which would make them an acquirer (in days)	10 days