Per Share Data (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Restricted stock units				363,337
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average	1,541,472	1,764,374	1,625,254	1,825,181
Stock-Settled Stock Appreciation Rights
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average	360,031	360,031	360,031	360,173
Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average	1,332,817	587,115	1,320,211	611,895
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average	2,690,950	0	2,690,950	0