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Stock-Based Compensation (Details) 5 (Restricted Stock Units (RSUs) [Member], USD $)
In Thousands, unless otherwise specified |
3 Months Ended |
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Mar. 31, 2014
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LTIP Plan [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Unrecognized compensation costs on nonvested awards | $ 54,078 |
| Unrecognized compensation costs on nonvested awards, weighted average period of recognition (in years) | 2 years 6 months 22 days |
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Assumed Plans [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Unrecognized compensation costs on nonvested awards | $ 16,275 |
| Unrecognized compensation costs on nonvested awards, weighted average period of recognition (in years) | 3 years 2 months 8 days |