Cost of Shares Repurchased from Employees and Directors to settle tax obligations related to share vesting

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Number of Performance Based Shares Awarded During Period-Target

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Shares Repurchased from Employees and Directors to settle tax obligations related to share vesting.

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Face amount or stated value per share of common stock.

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Value of stock issued under share-based plans to employees or officers which is the unearned portion, accounted for under the fair value method.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of noncash expense for share-based payment arrangement.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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.

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Number of shares authorized for issuance under share-based payment arrangement.

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Percentage of vesting of award under share-based payment arrangement.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Shareholders' Equity and Share Based Payment Shareholders' Equity and Share Based Payment (Details Textual) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	May 21, 2019	Mar. 31, 2019	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash share-based payment expense	$ 15,830	$ 11,488	$ 13,148
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	303,300	291,900	315,500
Stock Repurchased During Period, Value	$ 36,739	$ 71,421	$ 4,862
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition	1 year 11 months 15 days
Other Deferred Compensation Arrangements, Liability, Current	$ 15,149
Stock Repurchase Program, Authorized Amount				$ 100,000
Remaining authorized repurchase amount	$ 90,351				$ 76,019
Common shares, par value	$ 0.01	$ 0.01
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	334,000.0	487,200	518,400			676,700
Shares Repurchased from Employees and Directors	640,452
Cost of Shares Repurchased from Employees and Directors	$ 18,357
NumberofPerformanceBasedShares	337,564
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
NumberofPerformanceBasedShares	0
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
NumberofPerformanceBasedShares	675,128
Amended and Restated 2014 plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance	6,750,000
Prior Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance	333,974
TSR Performance Based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	362,681	169,631	107,426
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	222,184	277,057	199,941			143,414
NumberofPerformanceBasedShares	168,784
TSR Performance Based Shares \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0.00%
NumberofPerformanceBasedShares	0
TSR Performance Based Shares \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	200.00%
NumberofPerformanceBasedShares	337,568
Target AROE PSUs Granted [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	56,260
Total Performance-Based Shares Granted
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	225,044
Target TSR PSUs Granted [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	168,784
AROE Performance Based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	392,667	266,244	116,721
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	22,967	215,905	105,189			47,802
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	3 years
NumberofPerformanceBasedShares	168,780
AROE Performance Based Shares \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0.00%
NumberofPerformanceBasedShares	0
AROE Performance Based Shares \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
NumberofPerformanceBasedShares	337,560
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash share-based payment expense	$ 9,228
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount	$ 3,367
Performance Shares \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	3 years
Performance Shares \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	5 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash share-based payment expense	$ 6,602
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount	$ 2,965
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchased During Period, Shares	973,528
Stock Repurchased During Period, Value	$ 18,382