Preferred Stock (Details) - Mandatorily redeemable convertible preferred units - USD ($) $ / shares in Units, $ in Millions			3 Months Ended	6 Months Ended
	Mar. 30, 2015	Sep. 28, 2012	Jun. 30, 2015	Jun. 30, 2015
Series A Preferred Stock
Dividends payable	$ 13.0
Liquidation value (in dollars per share)	$ 1,241
Conversion rate for preferred stock (in dollars per share)	$ 110.00
Number of Common Shares Issuable Upon Conversion	71,893
Notional dividend amount of convertible preferred stock			$ 7.9
Minimum | Common Stock
Series A Preferred Stock
Additional shares of common stock to be issued upon conversion				580,151
Maximum | Common Stock
Series A Preferred Stock
Additional shares of common stock to be issued upon conversion				712,004
Eagle Property Acquisition
Series A Preferred Stock
Preferred stock, shares designated		325,000
Liquidation value (in dollars per share)		$ 1,000
Rate of interest for preferred stock (as a percent)		8.00%
Conversion rate for preferred stock (in dollars per share)				$ 135.00
Period required to convert preferred stock into common stock				15 days
Eagle Property Acquisition | Minimum
Series A Preferred Stock
Conversion rate for preferred stock (in dollars per share)				$ 110.00
Eagle Property Acquisition | Maximum
Series A Preferred Stock
Conversion rate for preferred stock (in dollars per share)				$ 135.00
$13.50
Series A Preferred Stock
Number of Common Shares Issuable Upon Conversion				2,987,558
$11.00
Series A Preferred Stock
Number of Common Shares Issuable Upon Conversion				3,666,549