Stock-Based Compensation Stock-Based Compensation - Stock Option Activity (Details) - Stock Options - Incentive Plan	6 Months Ended
	Jun. 30, 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	(147,750)
Outstanding, end of period (in shares) | shares	969,000
Number of Shares, exercisable (in shares) | shares	969,000
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	15.16
Outstanding, end of period (in dollars per share) | $ / shares	4.99
Weighted average exercise price, exercisable (in dollars per share) | $ / shares	$ 4.99
Weighted- Average Remaining Contractual Term, Outstanding	4 years 11 months 27 days
Weighted- Average Remaining Contractual Term, Exercisable	4 years 11 months 27 days
Aggregate Intrinsic Value, Outstanding | $	$ 20,240,000
Aggregate Intrinsic Value, Exercisable | $	20,240,000
Unrecognized compensation costs | $	$ 0