Stock-Based Compensation Stock-Based Compensation - Stock Option Activity (Details) - Stock Options - Incentive Plan	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares
Number of Options
Outstanding, beginning of period (in shares) | shares	1,116,750
Granted (in shares) | shares	0
Exercised (in shares) | shares	0
Expired or forfeited (in shares) | shares	(45,250)
Outstanding, end of period (in shares) | shares	1,071,500
Number of Shares, exercisable (in shares) | shares	1,071,500
Weighted- Average Exercise Price
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 6.34
Granted (in dollars per share) | $ / shares	0.00
Exercised (in dollars per share) | $ / shares	0.00
Expired or forfeited (in dollars per share) | $ / shares	12.74
Outstanding, end of period (in dollars per share) | $ / shares	6.07
Weighted average exercise price, exercisable (in dollars per share) | $ / shares	$ 6.07
Weighted- Average Remaining Contractual Term, Outstanding	4 years 9 months
Weighted- Average Remaining Contractual Term, Exercisable	4 years 9 months
Aggregate Intrinsic Value, Outstanding | $	$ 41,360,000
Aggregate Intrinsic Value, Exercisable | $	41,360,000
Unrecognized compensation costs | $	$ 0