Long-term Equity-based Compensation -Schedule of Share-based Compensation, Nonemployee Director Deferred Stock Unit Award Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Share-based Compensation, Nonemployee Director Deferred Stock Unit Award Plan [Abstract]
Total fair value of DSUs that vested during the years	$ 100,000	$ 200,000	$ 100,000
Deferred Stock Units, Outstanding, Number, Period Start (in shares)	8,000
Deferred Stock Units, Granted and Vested in Period (in shares)	3,500
Reduction for Shares Issued on Conversion (in shares)	$ (4,500)
Deferred Stock Units, Outstanding, Number, Period End (in shares)	7,000	8,000
Deferred Stock Units, Outstanding, Weighted Average Exercise Price, Period Start (per share)	$ 34.52
Deferred Stock Units, Granted and Vested in Period, Weighted Average Exercise Price (per share)	38.38
Reduction for Shares Issued on Conversion (per share)	34.94
Deferred Stock Units, Outstanding, Weighted Average Exercise Price, Period End (per share)	$ 36.17	$ 34.52