Income (Loss) Per Share (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Weighted Average Number of Shares Outstanding, Basic and Diluted	50,061,812	50,499,248	50,345,808	50,416,611
Earnings Per Share, Basic and Diluted	$ (0.57)	$ (0.28)	$ (1.20)	$ (0.52)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	4,793,037	4,598,443	4,851,737	4,598,443
Weighted Average Number of Shares Outstanding, Diluted				50,416,611
Earnings Per Share, Basic			$ (1.20)	$ (0.52)
Maximum [Member]
Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount	$ 6.75	$ 6.75	$ 6.75	$ 6.75