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Share Based Compensation (Details) (USD $)
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3 Months Ended | 12 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended | 24 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended | ||||||||
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Mar. 31, 2014
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Mar. 31, 2013
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Dec. 31, 2013
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Dec. 31, 2012
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Mar. 31, 2014
Minimum [Member]
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Mar. 31, 2014
Maximum [Member]
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Mar. 31, 2014
Share Options [Member]
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Feb. 18, 2014
Performance-Based Restricted Share Units [Member]
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Feb. 19, 2013
Performance-Based Restricted Share Units [Member]
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Mar. 31, 2014
Performance-Based Restricted Share Units [Member]
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Dec. 31, 2012
Performance-Based Restricted Share Units [Member]
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Feb. 18, 2014
CEO Non-Performance-Based Restricted Share Units [Member]
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Feb. 19, 2013
CEO Non-Performance-Based Restricted Share Units [Member]
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Mar. 01, 2012
CEO Non-Performance-Based Restricted Share Units [Member]
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Mar. 31, 2014
CEO Non-Performance-Based Restricted Share Units [Member]
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Feb. 18, 2014
Non-CEO Non-Performance-Based Restricted Share Units [Member]
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Feb. 19, 2013
Non-CEO Non-Performance-Based Restricted Share Units [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||
| Number of shares reserved for issuance under the Plan (in shares) | 10,000,000 | ||||||||||||||||
| Portion of options that will become exercisable on the first anniversary of the grant date | 25.00% | ||||||||||||||||
| Additional options vesting each quarter based on the grantee’s continued employment over a four-year period after the first anniversary | 6.25% | ||||||||||||||||
| Additional vesting period after first anniversary | 4 years | ||||||||||||||||
| Award expiration period | 10 years | ||||||||||||||||
| Assumptions: | |||||||||||||||||
| Volatility, minimum | 45.30% | ||||||||||||||||
| Volatility, maximum | 51.40% | ||||||||||||||||
| Risk-free interest rate, minimum | 0.85% | ||||||||||||||||
| Risk-free interest rate, maximum | 1.77% | ||||||||||||||||
| Weighted average expected lives | 6 years 1 month 6 days | ||||||||||||||||
| Forfeiture rate, minimum | 1.60% | ||||||||||||||||
| Forfeiture rate, maximum | 3.45% | ||||||||||||||||
| Dividend yield rate | 3.46% | 3.55% | |||||||||||||||
| Maximum term for estimated volatility | 5 years 7 months 6 days | ||||||||||||||||
| Expected volatility | 51.40% | ||||||||||||||||
| Number of Share Options, Outstanding [Roll Forward] | |||||||||||||||||
| Outstanding, beginning of period (in shares) | 2,439,413 | 2,795,437 | 2,795,437 | ||||||||||||||
| Granted (in shares) | 8,500 | 6,500 | |||||||||||||||
| Exercised (in shares) | (42,134) | (96,910) | |||||||||||||||
| Outstanding, end of period (in shares) | 2,405,779 | 2,705,027 | 2,439,413 | 2,795,437 | |||||||||||||
| Weighted Average Exercise Price [Roll Forward] | |||||||||||||||||
| Outstanding, beginning of period (in dollars per share) | $ 6.76 | $ 6.70 | $ 6.70 | ||||||||||||||
| Granted (in dollars per share) | $ 11.38 | $ 9.99 | |||||||||||||||
| Exercised (in dollars per share) | $ 4.36 | $ 3.51 | |||||||||||||||
| Outstanding, end of period (in dollars per share) | $ 6.82 | $ 6.82 | $ 6.76 | $ 6.70 | |||||||||||||
| Weighted average contractual term | 5 years 6 months 11 days | 6 years 6 months 15 days | 5 years 9 months | 6 years 9 months | |||||||||||||
| Weighted average grant date fair value (in dollars per share) | $ 2.05 | $ 2.03 | |||||||||||||||
| Unrecognized compensation cost related to non-vested share-based compensation arrangements | $ 412,000 | $ 513,000 | |||||||||||||||
| Nonvested awards, compensation cost not yet recognized, period for recognition | 4 years | ||||||||||||||||
| Performance period | 3 years | 2 years | |||||||||||||||
| Awards vested in period (in shares) | 0 | ||||||||||||||||
| Units awarded | 70,298 | 149,701 | 86,705 | 38,522 | 95,590 | ||||||||||||
| Fair value of awards | $ 11.38 | $ 10.02 | $ 8.56 | $ 11.38 | $ 10.02 | ||||||||||||
| Life of awards | 36 months | 22 months | |||||||||||||||
| Settlement period | 2 months 15 days | 2 months 15 days | |||||||||||||||
| Fair value of vested awards | 500,000 | ||||||||||||||||
| Annual vesting percentage | 33.33% | 33.33% | 50.00% | 50.00% | |||||||||||||
| Award, performance-based portion, percentage | 50.00% | 50.00% | |||||||||||||||
| Award, discretionary portion based on individual performance, percentage | 50.00% | 50.00% | |||||||||||||||
| Share-based compensation expense from adoption of ASC Topic 718 | $ 497,000 | $ 309,000 | $ 0 | ||||||||||||||