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Share based compensation (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (in dollars per share)	$ 14
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards vest on each anniversary (in hundredths)	20.00%
Vesting period	3 years
Exercise price (in dollars per share)	$ 14
Total number of units awarded (in units)	1,078,125
Contractual term	7 years
Dividend yield (in hundredths)	2.87%
Risk free rate of return (in hundredths)	2.15%
Expected volatility (in hundredths)	54.89%
Weighted average fair value of unit (in dollars per unit)	$ 4.28
Percentage of tranches for which share based compensation costs recognized (in hundredths)	20.00%
Share based compensation costs recognized	$ 560,071
Unrecognized share based compensation costs	4,056,460
Stock Appreciation Rights (SARs) [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average expected exercise life	4 years 10 months 24 days
Vesting period of tranches for which recognition of share based compensation costs will be accelerated	1 year
Stock Appreciation Rights (SARs) [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average expected exercise life	6 years
Vesting period of tranches for which recognition of share based compensation costs will be accelerated	2 years
Management Incentive Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total number of units awarded (in units)	6,250
Share based compensation costs recognized	11,250	11,250	16,674
Unrecognized share based compensation costs	$ 17,076
Number of years of service for units to be vest	5 years
Estimated fair value of each Management Incentive Unit (in dollars per unit)	$ 9
Period over which returns are expected	5 years
Cost of equity	25.00%
Period taken in to consideration to calculate probability of various returns	10 years

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This line item represents the average expected exercise life of units grant during the period.

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This line item represents the percentage of awards vest on each anniversary of the grant date.

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This line item represents the vesting period of tranches for which recognition of share based compensation costs will be accelerated.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 weighted average fair value at grant date for nonvested equity-based awards issued 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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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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.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Price of a single share of a number of saleable stocks of a company.

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