Stock-Based Compensation - Schedule of Outstanding Stock Appreciation Rights (Details) - Stock Appreciation Rights (SARs) - $ / shares	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Outstanding Shares [Roll Forward]
Outstanding at beginning of period (in shares)	1,010,000
Granted (in shares)	0
Exercised (in shares)	0
Expired/forfeited (in shares)	0
Outstanding at end of period (in shares)	1,010,000		1,010,000
Options vested and exercisable (in shares)	486,250	280,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Outstanding at beginning of period, Weighted Average Exercise Price Per Share (in dollars per share)	$ 6.30
Granted, Weighted Average Exercise Price Per Share (in dollars per share)	0.00
Exercised, Weighted Average Exercise Price Per Share (in dollars per share)	0.00
Expired/forfeited , Weighted Average Exercise Price Per Share (in dollars per share)	0.00
Outstanding at end of period, Weighted Average Exercise Price Per Share (in dollars per share)	6.30		$ 6.30
Options vested and exercisable, Weighted Average Exercise Price Per Share (in dollars per share)	$ 7.20		$ 7.20
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Non-vested RSUs, Weighted Average Remaining Contractual Term (in years)	3 years 3 months 18 days		3 years 5 months 18 days
Options vested and exercisable, Weighted Average Remaining Contractual Term (in years)	3 years