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Capital Transactions - Additional Information (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 07, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 30, 2014 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ 0.10 | $ 0 | $ 0.10 | $ 0.10 | $ 0.2 |  |  |  |
Cash dividends declared | $ 1,900,000 |  |  | $ 1,886,000 |  |  |  |  |
Weighted Average Exercise Price Per Share |  |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  |  | $ 13.50 |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |  |  |
Options outstanding at the beginning of the period (in shares) |  |  |  | 1,524,000 |  |  |  |  |
Granted (in shares) |  |  |  | 25,000 |  |  |  |  |
Forfeited or canceled (in shares) |  |  |  | 0 |  |  |  |  |
Exercised (in shares) |  |  |  | (9,000) | (25,000) |  |  |  |
Options outstanding at the end of the period (in shares) |  | 1,540,000 |  | 1,540,000 |  | 1,524,000 |  |  |
Weighted Average Exercise Price Per Share |  |  |  |  |  |  |  |  |
Options outstanding at the beginning of the period (in dollars per share) |  |  |  | $ 12.41 |  |  |  |  |
Forfeited or canceled (in dollars per share) |  |  |  | 0.00 |  |  |  |  |
Exercised (in dollars per share) |  |  |  | 11.98 | $ 2.35 |  |  |  |
Options outstanding at the end of the period (in dollars per share) |  | $ 12.34 |  | $ 12.34 |  | $ 12.41 |  |  |
Exercisable (in shares) |  | 1,409,000 |  | 1,409,000 |  | 1,201,000 |  |  |
Expected to vest (in shares) |  | 130,000 |  | 130,000 |  | 306,000 |  |  |
Aggregate Intrinsic value, outstanding |  | $ 2,200,000 |  | $ 2,200,000 |  | $ 4,200,000 |  |  |
Aggregate Intrinsic value, exercisable |  | 2,200,000 |  | 2,200,000 |  | 3,700,000 |  |  |
Aggregate intrinsic values of options exercised |  |  |  | 0 | $ 200,000 |  |  |  |
Aggregate Intrinsic value, expected to vest |  | 0 |  | 0 |  | 386,000 |  |  |
Tax benefit from the exercise of stock options |  |  |  | 0 | 100,000 |  |  |  |
Time-based stock options |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price Per Share |  |  |  |  |  |  |  |  |
Share-based compensation expense |  | 300,000 | $ 200,000 | 400,000 | 400,000 |  |  |  |
Unrecognized share-based compensation expense |  | $ 200,000 |  | $ 200,000 |  | $ 300,000 |  |  |
Weighted-average period over which the remaining compensation cost is expected to be recognized |  |  |  | 7 months |  |  |  |  |
Time-based stock options | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  |  | 48 months |  |  |  |  |
Performance based stock options operating income margins |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Operating income margin, one (as a percent) |  |  |  | 6.00% |  |  |  |  |
Operating income margin, two (as a percent) |  |  |  | 8.00% |  |  |  |  |
Operating income margin, three (as a percent) |  |  |  | 10.00% |  |  |  |  |
Performance based stock options sales |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price Per Share |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | $ 0 | $ 0 |  |  |  |
2012 Stock Incentive Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized under the plan |  |  |  |  |  |  |  |  | 1,500,000
Additional number of shares authorized under the plan |  |  |  |  |  |  | 1,500,000 |  |
Weighted Average Exercise Price Per Share |  |  |  |  |  |  |  |  |
Exercised (in dollars per share) |  |  |  | $ 13.50 |  |  |  |  |
Exercisable (in shares) |  | 25,000 |  | 25,000 |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value (in dollars per share) |  |  |  | $ 4.94 |  |  |  |  |
Expected contractual life (in years) |  |  |  | 5 years |  |  |  |  |
Risk-free interest rate (as a percent) |  |  |  | 1.75% |  |  |  |  |
Expected volatility (as a percent) |  |  |  | 39.80% |  |  |  |  |
Modification Plan |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price Per Share |  |  |  |  |  |  |  |  |
Expected to vest (in shares) |  | 131,000 |  | 131,000 |  |  |  |  |
Exercisable options, additional term |  |  |  | 1 year |  |  |  |  |
Incremental compensation expense |  |  |  | $ 100,000 |  |  |  |  |
2009 Incentive Plan | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized under the plan |  | 400,000 |  | 400,000 |  |  |  |  |
2014 Share Repurchase Program |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  | $ 20,000,000 |
Remaining balance available for repurchases |  | $ 13,400,000 |  | $ 13,400,000 |  |  |  |  |
Repurchase of common stock (in shares) |  |  |  | 0 |  | 0 |  |  |

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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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