Fair Value Measurements Fair Value, Reconciliation of Level 3 - Assets (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2016		Jun. 30, 2015	Jun. 30, 2016		Jun. 30, 2015		Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Purchases of Convertible Debt		$ 0		$ 5,000	$ 0		$ 5,000
Fair Value, Option, Changes in Fair Value, Gain (Loss)		(4,607)		450	(5,707)		450
AFS Securities, Beginning Asset Value		129,625		0	130,725		0
AFS Securities, Ending Asset Value		125,018		122,525	125,018		122,525
Unrealized Gains (Losses) Still Held - Assets		(4,607)	[1]	450	(5,707)	[1]	450	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value		14,788		233	14,788		233		$ 13,938	$ 10,781	$ 1,373	$ 1,983
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements		0		(716)	0		(716)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements)		0		0	(285)		(331)
Gain from changes in fair value of contingent consideration	[2]	850		(424)	4,292		(703)
Fair Value, Measurement with Unobservable Inputs, Unrealized Gain Loss	[1]	850		(857)	4,166		(1,091)
Convertible debt securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings	[3]	199		187	237		187
AFS Securities, Beginning Asset Value		10,173		2,757	10,116		2,527
AFS Debt Security, (losses) included in OCI		201		82	220		312
AFS Securities, Ending Asset Value		10,573		8,026	10,573		8,026
Unrealized Gains (Losses) Still Held - Assets	[1]	400		269	457		499
Redeemable preferred shares [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
AFS Securities, Beginning Asset Value		22,699		4,900	22,834		4,910
AFS Debt Security, (losses) included in OCI		(356)		(19)	(491)		(29)
AFS Securities, Ending Asset Value		22,343		4,881	22,343		4,881
Unrealized Gains (Losses) Still Held - Assets	[1]	(356)		(19)	(491)		(29)
Monster LP [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		1,300		450	1,400
2016 [Member] | Retained Investment in Business [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
AFS Securities, Ending Asset Value		$ 0			$ 0
2015 [Member] | Retained Investment in Business [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
AFS Securities, Ending Asset Value				$ 122,075			$ 122,075

[1] Represents the unrealized losses or gains recorded in earnings and/or other comprehensive income (loss) during the period for assets and liabilities classified as Level 3 that are still held (or outstanding) at the end of the period.

[2] Changes in the fair value of contingent consideration liabilities are classified within "Acquisition-related expense (benefit), net" on the condensed consolidated statements of operations.

[3] Represents accretion of interest income and changes in the fair value of an embedded derivative.