Stockholder Rights Plan (Details)		12 Months Ended
	Mar. 22, 2013	Dec. 31, 2015	May. 09, 2013
Equity [Abstract]
Ownership interest to cause cumulative change in ownership (or more than) (as a percent)	5.00%
Period of cumulative change in ownership	3 years
Beneficial owner of common stock percentage (or more than)	4.90%		4.90%
Period of review		3 years
Beneficial ownership percentage post standstill period (up to)		50.00%
Beneficial owner of common stock percentage in future (more than)		50.00%
Period of offer to purchase common stock		60 days