Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets [Abstract]
Cash equivalents	$ 128,142	$ 408,142
Derivative asset		252
Total assets		408,394
Temporary equity [Abstract]
Redeemable noncontrolling interest	131,670	133,000
Liabilities:
Derivative liability	1,284
Discount rate	11.00%
Level 1 [Member]
Assets [Abstract]
Cash equivalents	128,142	408,142
Total assets		408,142
Level 2 [Member]
Assets [Abstract]
Derivative asset		252
Total assets		252
Liabilities:
Derivative liability	1,284
Level 3 [Member]
Temporary equity [Abstract]
Redeemable noncontrolling interest	$ 131,670	$ 133,000