Investments - Carrying Value of Investments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Investments in and Advances to Affiliates [Line Items]
Investments in merchant banking funds	$ 11,745	$ 16,772
Investments	0	34,165
GCP I
Investments in and Advances to Affiliates [Line Items]
Investments in merchant banking funds	2,257	2,247
Barrow Street III
Investments in and Advances to Affiliates [Line Items]
Investments in merchant banking funds	1,798	1,985
GCP II [Member]
Investments in and Advances to Affiliates [Line Items]
Investments in merchant banking funds	7,690	11,173
GCP
Investments in and Advances to Affiliates [Line Items]
Investments in merchant banking funds	0	1,367
Carrying Value
Investments in and Advances to Affiliates [Line Items]
Investments	11,745	50,937
Carrying Value | Merchant Banking Funds
Investments in and Advances to Affiliates [Line Items]
Investments	11,745	16,772
Carrying Value | Iridium common stock
Investments in and Advances to Affiliates [Line Items]
Investments	0
Fair Value, Measurements, Recurring
Investments in and Advances to Affiliates [Line Items]
Investments		34,165
Fair Value, Measurements, Recurring | Iridium common stock
Investments in and Advances to Affiliates [Line Items]
Investments		34,165
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 [Member]
Investments in and Advances to Affiliates [Line Items]
Investments		34,165
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 [Member] | Carrying Value | Iridium common stock
Investments in and Advances to Affiliates [Line Items]
Investments		$ 34,165