Stock-Based Compensation (Narrative) (Details) - USD ($) | Sep. 07, 2018 | Aug. 23, 2017 | Sep. 30, 2018 | May 31, 2017 | Aug. 31, 2016 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Number of stock options awarded | | | | | | | | | | 600,000 | | |
Stock-based compensation charge (reversal), net | | | | | | $ 598,000 | | $ 608,000 | | $ 1,185,000 | $ 1,435,000 | |
Number of shares, forfeitures | | | | | | | | | | 200,000 | 37,333 | |
Deferred tax asset | | | | | | 800,000 | | | | $ 800,000 | | $ 700,000 |
Valuation allowances | | | | | | $ 800,000 | | | | $ 800,000 | | $ 700,000 |
Common stock, shares issued | | | | | | 56,833,925 | | | | 56,833,925 | | 56,685,925 |
August 2017 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Performance target, per share | | | | | | | | | | $ 23 | | |
Percentage of increase target price | | | | | | | | | | 35.00% | | |
Closing price, per share | | $ 9.38 | | | | | | | | | | |
Stock Options [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Exercisable stock options | | | | | | 0 | | 0 | | 0 | 105,982 | |
Unrecognized compensation cost | | | | | | $ 1,100,000 | | | | $ 1,100,000 | | |
Unrecognized compensation cost, expected recognition period, years | | | | | | | | | | 3 years | | |
Expected volatility | | | | | | | | | | 44.00% | | |
Expected life (in years) | | | | | | | | | | 3 years | | |
Risk-free rate | | | | | | | | | | 2.75% | | |
Expected volatility calculation term | | | | | | | | | | 750 days | | |
Options exercise price range, lower limit | | | | | | | | | | $ 6.20 | | |
Options exercise price range, upper limit | | | | | | | | | | $ 13.16 | | |
Stock Options [Member] | Executive Officers [Member] | August 2008 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Number of shares, forfeitures | | | | | | | | | | 200,000 | | |
Strike price | | | | | | | | | | $ 24.46 | | |
Stock Options [Member] | Executive Officers And Employees [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Number of stock options awarded | | | | | | 0 | | 0 | | 600,000 | 0 | |
Stock Options [Member] | Employees [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Number of shares, forfeitures | | | | | | | | | | | 37,333 | |
Restricted Stock [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Number of stock options awarded | | | | | | | | | | 148,000 | 588,594 | |
Fair value of restricted stock vested | | | | | | | $ 500,000 | | $ 500,000 | | | |
Unrecognized compensation cost | | | | | | $ 2,600,000 | | | | $ 2,600,000 | | |
Unrecognized compensation cost, expected recognition period, years | | | | | | | | | | 2 years | | |
Forfeitures, Number of Shares of Restricted Stock | | | | | | | | (30,635) | | | (30,635) | |
Vested number of shares of restricted stock | | | | | | | | | | 52,594 | 56,250 | |
Restricted Stock [Member] | September 2018 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Expected volatility | | | 37.40% | | | | | | | | | |
Expected life (in years) | | | 3 years | | | | | | | | | |
Future dividends | | | $ 0 | | | | | | | | | |
Expected volatility calculation term | | | 30 days | | | | | | | | | |
Restricted Stock [Member] | September 2018 [Member] | Below $15 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Vesting percentage | | | 0.00% | | | | | | | | | |
Restricted Stock [Member] | September 2018 [Member] | At or above $15 and below $19 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Vesting percentage | | | 33.00% | | | | | | | | | |
Restricted Stock [Member] | September 2018 [Member] | At or above $19 and below $23 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Vesting percentage | | | 66.00% | | | | | | | | | |
Restricted Stock [Member] | September 2018 [Member] | At or above $23 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Vesting percentage | | | 100.00% | | | | | | | | | |
Restricted Stock [Member] | August 2017 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Expected volatility | | | | | | | | | | 44.00% | | |
Expected life (in years) | | | | | | | | | | 3 years | | |
Future dividends | | | | | | | | | | $ 0 | | |
Expected volatility calculation term | | | | | | | | | | 30 days | | |
Strike price | | | | | | | | | | $ 0 | | |
Restricted Stock [Member] | August 2017 [Member] | Below $15 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Vesting percentage | | | | | | | | | | 0.00% | | |
Restricted Stock [Member] | August 2017 [Member] | At or above $15 and below $19 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Vesting percentage | | | | | | | | | | 33.00% | | |
Restricted Stock [Member] | August 2017 [Member] | At or above $19 and below $23 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Vesting percentage | | | | | | | | | | 66.00% | | |
Restricted Stock [Member] | August 2017 [Member] | At or above $23 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Performance target, per share | | | | | | | | | | $ 23 | | |
Vesting percentage | | | | | | | | | | | 100.00% | |
Restricted Stock [Member] | August 2016 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Number of stock options awarded | | | | 150,000 | | | | | | | | |
Restricted Stock [Member] | Executive Officers [Member] | September 2018 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Performance target, per share | $ 23 | | | | | | | | | | | |
Percentage of increase target price | 55.00% | | | | | | | | | | | |
Closing price, per share | $ 6.20 | | | | | | | | | | | |
Restricted Stock [Member] | Executive Officers [Member] | August 2017 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Number of stock options awarded | | | 210,000 | | | | | | | | | |
Restricted Stock [Member] | Executive Officers [Member] | August 2016 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Number of stock options awarded | | | | | 350,000 | | | | | | | |
Restricted Stock [Member] | Non-Employee Directors [Member] | August 2017 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Number of stock options awarded | | | 52,594 | | | | | | | | | |
Restricted Stock [Member] | Executive Officers And Employees [Member] | August 2017 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Number of stock options awarded | | | 326,000 | | | | | | | | | |
Restricted Stock [Member] | Former Chief Executive Officer [Member] | August 2016 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Number of stock options awarded | | | | 200,000 | | | | | | | | |
Restricted Stock [Member] | One-Third Shares Vest 2019 Fundamental EPS [Member] | August 2016 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Fundamental EPS, to be achieved | | | | | | | | | | 2.60 | | |
Restricted Stock [Member] | Two-Thirds Shares Vest 2019 Fundamental EPS [Member] | August 2016 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Fundamental EPS, to be achieved | | | | | | | | | | 2.80 | | |
Restricted Stock [Member] | All Shares Vest 2019 Fundamental EPS [Member] | August 2016 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Fundamental EPS, to be achieved | | | | | | | | | | $ 3 | | |
Restricted Stock [Member] | Full Time Basis [Member] | Executive Officers And Employees [Member] | August 2017 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Vesting date | | | | | | | | | | Aug. 23, 2020 | | |
Restricted Stock [Member] | Recipient Is A Director [Member] | Non-Employee Directors [Member] | August 2017 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Vesting date | | | | | | | | | | Aug. 23, 2018 | | |
2019 Fundamental EPS [Member] | August 2016 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Fundamental EPS, linear interpolation | | | | | | | | | | $ 2.80 | | |
Minimum [Member] | Restricted Stock [Member] | September 2018 [Member] | At or above $15 and below $19 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Performance target, per share | | | $ 15 | | | | | | | | | |
Minimum [Member] | Restricted Stock [Member] | September 2018 [Member] | At or above $19 and below $23 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Performance target, per share | | | 19 | | | | | | | | | |
Minimum [Member] | Restricted Stock [Member] | September 2018 [Member] | At or above $23 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Performance target, per share | | | 23 | | | | | | | | | |
Minimum [Member] | Restricted Stock [Member] | August 2017 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Risk-free rate | | | | | | | | | | 1.275% | | |
Minimum [Member] | Restricted Stock [Member] | August 2017 [Member] | At or above $15 and below $19 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Performance target, per share | | | | | | | | | | $ 15 | | |
Minimum [Member] | Restricted Stock [Member] | August 2017 [Member] | At or above $19 and below $23 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Performance target, per share | | | | | | | | | | 19 | | |
Minimum [Member] | 2019 Fundamental EPS [Member] | August 2016 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Fundamental EPS | | | | | | | | | | $ 2.60 | | |
Maximum [Member] | Restricted Stock [Member] | September 2018 [Member] | Below $15 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Performance target, per share | | | 15 | | | | | | | | | |
Maximum [Member] | Restricted Stock [Member] | September 2018 [Member] | At or above $15 and below $19 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Performance target, per share | | | 19 | | | | | | | | | |
Maximum [Member] | Restricted Stock [Member] | September 2018 [Member] | At or above $19 and below $23 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Performance target, per share | | | $ 23 | | | | | | | | | |
Maximum [Member] | Restricted Stock [Member] | August 2017 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Risk-free rate | | | | | | | | | | 1.657% | | |
Maximum [Member] | Restricted Stock [Member] | August 2017 [Member] | Below $15 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Performance target, per share | | | | | | | | | | $ 15 | | |
Maximum [Member] | Restricted Stock [Member] | August 2017 [Member] | At or above $15 and below $19 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Performance target, per share | | | | | | | | | | 19 | | |
Maximum [Member] | Restricted Stock [Member] | August 2017 [Member] | At or above $19 and below $23 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Performance target, per share | | | | | | | | | | 23 | | |
Maximum [Member] | 2019 Fundamental EPS [Member] | August 2016 [Member] | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | |
Fundamental EPS | | | | | | | | | | $ 3 | | |